Transcript
SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
D D D D D D
DW PACKAGE (TOP VIEW)
Single-Chip Interface Solution for AppleTalk and LocalTalk Designed to Operate Up To 1 Mbps In AppleTalk and LocalTalk Switched-Capacitor Voltage Converter Allows for Single 5-V Operation 4-kV ESD Protection on Bus Terminals Combines Multiple Components into a Single Chip Solution LinBiCMOS Process Technology
1 2 3 4 5 6 7 8 9 10
HSKA VSS C– C+ DEN DY DZ GND VCC DA
20 19 18 17 16 15 14 13 12 11
GND VCC HSKY RY2 RA2 RB2 RB1 RA1 RY1 REN
description The SN75LBC775 is a low-power LinBiCMOS device that incorporates the drivers and receivers for an AppleTalk or a LocalTalk interface and a switched-capacitor voltage converter for a single 5-V supply operation. LocalTalk uses a hybrid of RS-422 with the transceiver connected to the network through a small isolation transformer. The AppleTalk mode provides point-to-point communications and uses the same differential driver and receiver as LocalTalk with the addition of a hybrid RS-423, single-ended handshake driver (HSK) and receiver. In the AppleTalk mode, the port connects directly to the receiver with no isolation transformer.
functional diagram
HSKA
1
18
6 DA
DEN
While the device power is turned off (VCC = 0) or disabled in the LocalTalk mode, the outputs are in a high-impedance state. When the driver enable (DEN) terminal is high, both the differential and serial driver outputs are in a high-impedance state.
RY1
RY2
The receiver output can be disabled and becomes a high impedance when the REN terminal is low.
REN VCC
A switched-capacitor voltage converter generates the negative voltage required from a single 5-V supply using two 22-µF capacitors. One capacitor is between the C + and C – terminals and the second is between VSS and ground.
GND
10
7
HSKY
DY DZ
5 13
12
14 16
17
15
RA1 RB1 RA2 RB2
11 19 8
Charge Pump
2 VSS –5 V
The SN75LBC775 is characterized for operating over the temperature range of 0°C to 70°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
LocalTalk and AppleTalk are trademarks of Apple Computer, Inc. LinBiCMOS is a trademark of Texas Instruments Incorporated. Copyright 1996, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
DRIVER FUNCTION TABLE ENABLE
INPUT
RECEIVER FUNCTION TABLE
OUTPUT
INPUT
ENABLE
OUTPUT
RA
RB
REN
RY
X
H
L
H
H
X
L
H
H
L
OPEN
H
H
H
SHORT†
H
?
L
L
X
L
Z
Z
Z
Z
Z
Z
Z
DA
HSKA
DEN
A
B
HSKY
H
X
L
H
L
L
X
L
L
H
X
H
L
X
X
L
X
L
L
X
X
OPEN
OPEN
L
H
X
X
H
X
X
OPEN
H = high level,
L = low level,
X = irrelevant,
† – 0.2 V < VID < 0.2 V
? = indeterminate,
Z = high impedance (off)
schematics of inputs and outputs ALL LOGIC INPUTS
RECEIVER INPUTS VCC
VCC
A Input Only 24 kΩ
5 kΩ
Input
Input 1 kΩ
B Input Only
HSKY OUTPUT
DY AND DZ OUTPUTS
10 kΩ
RECEIVER OUTPUTS
VCC
VCC
VCC
Output
2
DZ Output
DY Output
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4 kΩ Output
SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 to 7 V Supply voltage range, VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 7 to 0.5 V Receiver input voltage range, VI (RA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 15 V to 15 V Receiver differential input voltage range, VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 12 V to 12 V Receiver output voltage range, VO (RY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 5.5 V Driver output voltage range, VO (Power Off) (DY, DZ, HSKY) . . . . . . . . . . . . . . . . . . . . . . . . . – 15 V to 15 V (Power On) (DY, DZ, HSKY) . . . . . . . . . . . . . . . . . . . . . . . . – 11 V to 11 V Driver input voltage range, VI (DA, HSKA, DEN, REN) . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC + 0.4 V Electrostatic discharge (see Note 2) Class 3, A: Bus terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 kV All other terminals . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table Operating free-air temperature range,TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C † Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTES: 1. All voltage values are with respect to network ground terminal unless otherwise noted. 2. This maximum rating is tested according to MIL-STD-883C, Method 3015.7. DISSIPATION RATING TABLE PACKAGE
TA ≤ 25°C POWER RATING
DERATING FACTOR ABOVE TA = 25°C
TA = 85°C POWER RATING
DW
1125 mW
9.0 mW/°C
585 mW
recommended operating conditions Supply voltage, VCC High-level input voltage, VIH
DA, HSKA, DEN, REN
Low-level input voltage, VIL
DA, HSKA, DEN, REN
Receiver input common-mode voltage range, VICR‡ Differential input voltage, VID‡ Voltage-converter filter capacitance
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
2
V 0.8
V
–7
7
V
– 12
12
V µF
22
Voltage-converter filter-capacitor equivalent series resistance (ESR) Operating free-air temperature, TA
0
2
Ω
70
°C
‡ The algebraic convention, in which the less-positive (more negative) limit is designated minimum, is used in this data sheet.
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
DRIVER electrical characteristics over recommend operating characteristics (unless otherwise noted) PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
VOH VOL
High-level output voltage
|VOD|
Magnitude of differential output voltage (VDY – VDZ)
See Figure 2
∆|VOD|
Change in differential voltage magnitude Common-mode output voltage‡
See Figure 2
Change in steady-state common-mode output voltage
See Figure 3
± 200
mV
IOZ
High-impedance output current
VCC = 0, –10 V ≤ VO ≤ 10 V
± 100
µA
IOS
Short-circuit output current
– 5 V ≤ VO ≤ 5 V
450
mA
ICC
Supply current
DEN at 0 V, No load
5
10
mA
IIH
High-level input current
200
µA
– 100
– 200
µA
– 300
– 455
µA
Low-level output voltage
VOC ∆VOC(SS)
IIL
low level input current low-level
Single ended
RL = 3 kΩ kΩ,
See Figure 1
3.7
UNIT
4.0
V
–1
REN at 5 V,
VI = 0
REN
250
mV
V 3
VI = 5 V All terminals except REN
V
5.6 10
See Figure 3
– 3.7
V
† All typical values are at VCC = 5 V and TA = 25°C. ‡ The algebraic convention, in which the less positive (more negative) limit is designated minimum, is used in this data sheet.
switching characteristics over recommend operating conditions (unless otherwise noted) PARAMETER tPHL
Propagation delay time, time highhigh to low-level low level
TYP
MAX
UNIT
Single ended
TEST CONDITIONS
MIN
155
300
ns
Differential
115
180
ns
Single ended
140
300
ns
tPLH
Propagation delay time, time lowlow to high-level high level
Differential
115
180
ns
tPZL tPZH
Propagation delay time, high-impedance to low-level output
100
250
ns
Propagation delay time, high-impedance to high-level output
100
250
ns
tPLZ
Propagation delay time, low-level to high-impedance output
100
250
ns
tPHZ
Propagation delay time, high-level to high-impedance output
100
250
ns
135
300
ns
90
180
ns
tr
Rise time
tf
Fall time
tsk(p)
4
Pulse skew, skew |tPLH-tPHL|
See Figures 1 and 2
Single ended Differential Single ended
145
300
ns
Differential
95
180
ns
Single ended
15
50
ns
2
22
ns
Differential
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
RECEIVER electrical characteristics over recommended operating conditions (unless otherwise noted) PARAMETER
TEST CONDITIONS
VIT + VIT –
Positive-going differential input voltage threshold
Vhys VOH
Input voltage hysteresis (VIT + – VIT –)
VOL
Low-level output voltage
IOS
Negative-going differential input voltage threshold‡
TYP†
MAX
UNIT
200
mV
– 200 IOH = 2 mA, A See Figure 4
IOL = – 2mA, 2 A
High-level output voltage VO = 0 VO = VCC
Short circ it output Short-circuit o tp t current c rrent‡
MIN
mV 30
mV
2
4.5
V 0.8
V
8
50
85
mA
– 85
– 50
–8
mA
ri Input resistance VCC = 0 or 5.25 V, – 12 V ≤ VI ≤ 12 V 6 † All typical values are at VCC = 5 V and TA = 25°C. ‡ The algebraic convention, in which the less positive (more negative) limit is designated minimum, is used in this data sheet.
kΩ
switching characteristics over recommended operating conditions (unless otherwise noted) PARAMETER
TEST CONDITIONS
MIN
TYP†
MAX
25
60
ns
22
60
ns
8
25
ns
7
25
ns
3
20
ns
UNIT
tPHL tPLH
Propagation delay time, high- to low-level output
tr tf
Rise time
tSK(P)
Pulse skew, |tPLH – tPHL|
tPZL tPZH
Receiver output enable time to low-level output
50
ns
Receiver output enable time to high-level output
50
ns
50
ns
50
ns
Propagation delay time, low- to high-level output RL = 2 kΩ kΩ, See Figure 4
CL = 15 pF, pF
Fall time
tPLZ Receiver output disable time to low-level output tPHZ Receiver output disable time to high-level output † All typical values are at VCC = 5 V and TA = 25°C.
CL = 80 pF, pF
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See Figure 5
POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
PARAMETER MEASUREMENT INFORMATION 776 pF II
51 Ω
HSKY
3V 1.5 V 0V
Inputs DA, HSKA
3 kΩ
HSKA VI
tPLH
VO
776 pF 51 Ω
DY II
51 Ω
VI
90%
tf
tr
90%
3 kΩ
DZ, HSKY
90% 10%
DZ VO
DEN
90%
10%
776 pF
VO
DA
Outputs DY
3 kΩ
tf
TEST CIRCUIT
tPHL VOH 0V 10% V OL
10%
VOH 0V VOL
tr
VOLTAGE WAVEFORM (see Note A)
Figure 1. Driver Propagation and Transition Times for AppleTalk 51 Ω
DY VOD
DA DEN
DZ
220 pF
220 pF 51 Ω
TEST CIRCUIT
3V DEN
1.5 V
1.5 V
1.5 V
1.5 V
0V 3V DA
1.5 V
1.5 V
0V tPHZ
tPZH tPHL
tPLH
tPLZ
VODH VOD VODL tPZL
tr
tf VOLTAGE WAVEFORM (see Note A)
NOTE A: The input waveform tr, tf < = 10 ns
Figure 2. Driver Propagation and Transition Times for LocalTalk
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POST OFFICE BOX 655303 DALLAS, TEXAS 75265 POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
PARAMETER MEASUREMENT INFORMATION DY 47 Ω VOD
DA
47 Ω
VOC
DEN DZ TEST CIRCUIT
3V 1.5 V
1.5 V
VIN
0V
VOC
0V ∆ VOC(SS) VOLTAGE WAVEFORM
Figure 3. Differential Driver Common Mode Output Voltage Tests VCC 2 kΩ VI
REN
RA RB
+ 2.5 V
RB VI
– 2.5 V tPLH
VO
VO
15 pF
0V
RA
IO
+ _
0V
90%
tf
tr TEST CIRCUIT
90%
10%
tPHL VOH + 1.5 V 10% V OL
VOLTAGE WAVEFORM (see Note A)
NOTE A: The input waveform tr, tf < = 10 ns
Figure 4. Receiver Propagation and Transition Times ± 2.5 V or – 2.5 V
VCC RA RB
+ _
RY
RL = 500 Ω
S1
CL REN TEST CIRCUIT 3V 1.5 V
REN
1.5 V 0V
tPLZ VO S1 to VCC RA at – 2.5 V VO S1 at GND RA at 2.5 V
tPZL VOH 0V VOL
tPHZ
tPZH VOH 0V VOL VOLTAGE WAVEFORM
Figure 5. Receiver Enable and Disable Test Circuit and Waveform
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
TYPICAL CHARACTERISTICS MAXIMUM DRIVER DATA RATE vs CAPACITIVE LOAD
Maximum Driver Data Rate – Mbits/s
3
2.5
2
1.5
1
0.5 VO = 0 No Load 0 0
100
200
300
400
500
600
700
CL – Capacitive Load – pF
Figure 6
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
APPLICATION INFORMATION VCC 0.1 µF 1 2
Single-Ended Driver Input 22 µF
To Receiver
+
22 µF
0.1 µF
51 Ω
0.1 µF
51 Ω
3 4
+
5 6 7 8 9
0.1 µF
10
SN75LBC775 HSKA GND VSS C– C+ DEN
VCC HSKY RY2 RA2
DY DZ
RB2 RB1 RA1
GND VCC
RY1
DA
REN
20
22 pF
19
51 Ω
18 17
To Single-Ended Receiver Receiver 2 Output
16
+ Receiver 2 Input – Receiver 2 Input
15 14
– Receiver 1 Input
13
+ Receiver 1 Input
12
Receiver 1 Output
11
Differential Driver Input APPLETALK VCC 0.1 µF NC Isolation Transformer To LAN
22 µF
+
22 µF
220 pF
51 Ω
220 pF
51 Ω
+
1 2 3 4 5 6 7 8 9
0.1 µF
10
SN75LBC775 HSKA GND VSS C– C+ DEN
VCC HSKY RY2 RA2
DY DZ
RB2 RB1 RA1
GND VCC
RY1
DA
REN
20 19 18 17 16
NC Receiver 2 Output
15 14 13 12 11
+ Receiver 2 Input – Receiver 2 Input – Receiver 1 Input + Receiver 1 Input Receiver 1 Output
Differential Driver Input LOCALTALK
NC – No internal connection
RS-423 Input
RB RA
–
RY
+
Receiver Output
Figure 7. Receiving RS-423 Signals With a Differential Receiver
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SN75LBC775 SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER SLLS216A – MAY 1995 – REVISED JANUARY 1996
MECHANICAL INFORMATION DW (R-PDSO-G**)
PLASTIC SMALL-OUTLINE PACKAGE
16 PIN SHOWN
PINS **
0.050 (1,27)
16
20
24
28
A MAX
0.410 (10,41)
0.510 (12,95)
0.610 (15,49)
0.710 (18,03)
A MIN
0.400 (10,16)
0.500 (12,70)
0.600 (15,24)
0.700 (17,78)
DIM 0.020 (0,51) 0.014 (0,35) 16
0.010 (0,25) M 9
0.419 (10,65) 0.400 (10,15) 0.299 (7,59) 0.293 (7,45)
0.010 (0,25) NOM
Gage Plane 0.010 (0,25) 1
8 0°– 8° A
0.050 (1,27) 0.016 (0,40)
Seating Plane 0.104 (2,65) MAX
0.012 (0,30) 0.004 (0,10)
0.004 (0,10)
4040000 / B 10/94 NOTES: B. C. D. E.
10
All linear dimensions are in inches (millimeters). This drawing is subject to change without notice. Body dimensions do not include mold flash or protrusion, not to exceed 0.006 (0,15). Falls within JEDEC MS-013
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Copyright 1998, Texas Instruments Incorporated
