Texas Instruments SN75LBC775DW, SN75LBC775DWR Datasheet
SN75LBC775
SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER
SLLS216A – MA Y 1995 – REVISED JANUARY 1996
1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
D
Single-Chip Interface Solution for
AppleTalk and LocalTalk
D
Designed to Operate Up To 1 Mbps In
AppleTalk and LocalTalk
D
Switched-Capacitor Voltage Converter
Allows for Single 5-V Operation
D
4-kV ESD Protection on Bus Terminals
D
Combines Multiple Components into a
Single Chip Solution
D
LinBiCMOS Process Technology
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.
While the device power is turned off (V
CC
= 0) or
disabled in the LocalT alk 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.
The receiver output can be disabled and becomes
a high impedance when the REN terminal is low.
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 V
SS
and ground.
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.
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
HSKA
V
SS
C–
C+
DEN
DY
DZ
GND
V
CC
DA
GND
V
CC
HSKY
RY2
RA2
RB2
RB1
RA1
RY1
REN
DW PACKAGE
(TOP VIEW)
functional diagram
HSKY
DY
DZ
RY1
RY2
HSKA
DA
DEN
RA1
RB1
REN
RA2
RB2
Charge Pump
V
SS
–5 V
V
CC
GND
1
10
5
12
17
11
19
8
18
6
7
13
14
16
15
2
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.
Copyright 1996, Texas Instruments Incorporated
LocalTalk and AppleTalk are trademarks of Apple Computer, Inc.
LinBiCMOS is a trademark of Texas Instruments Incorporated.
SN75LBC775
SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER
SLLS216A – MA Y 1995 – REVISED JANUARY 1996
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
DRIVER FUNCTION TABLE RECEIVER FUNCTION TABLE
INPUT
ENABLE OUTPUT INPUT ENABLE OUTPUT
DA HSKA DEN ABHSKY RA RB REN RY
H X L HL X HL H H
L X L LHX LH H L
X H L XX L OPEN H H
X L L XX H SHORT
†
H ?
OPEN OPEN L HL L X L Z
X X H ZZ
Z
†
–0.2 V < VID < 0.2 V
X X OPEN ZZ Z
H = high level, L = low level, X = irrelevant, ? = indeterminate, Z = high impedance (off)
schematics of inputs and outputs
Input
V
CC
1 kΩ
10 kΩ
B Input
Only
A Input
Only
24 kΩ
5 kΩ
V
CC
Input
V
CC
Output
V
CC
DY
Output
DZ
Output
V
CC
4 kΩ
Output
ALL LOGIC INPUTS RECEIVER INPUTS
HSKY
OUTPUT DY AND DZ OUTPUTS RECEIVER OUTPUTS
SN75LBC775
SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER
SLLS216A – MA Y 1995 – REVISED JANUARY 1996
3
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
(see Note 1) –0.5 to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply voltage range, V
SS
–7 to 0.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver input voltage range, V
I
(RA) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver differential input voltage range, V
ID
–12 V to 12 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver output voltage range, V
O
(RY) –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver output voltage range, V
O
(Power Off) (DY, DZ, HSKY) –15 V to 15 V. . . . . . . . . . . . . . . . . . . . . . . . .
(Power On) (DY, DZ, HSKY
) –11 V to 11 V. . . . . . . . . . . . . . . . . . . . . . . .
Driver input voltage range, V
I
(DA, HSKA, DEN, REN) –0.5 V to V
CC
+ 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,T
A
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
T
≤ 25°C DERATING FACTOR T
= 85°C
PACKAGE
A
POWER RATING ABOVE TA = 25°CAPOWER RATING
DW 1125 mW 9.0 mW/°C 585 mW
recommended operating conditions
MIN NOM MAX UNIT
Supply voltage, V
CC
4.75 5 5.25 V
High-level input voltage, V
IH
DA, HSKA, DEN, REN 2 V
Low-level input voltage, V
IL
DA, HSKA, DEN, REN 0.8 V
Receiver input common-mode voltage range, V
ICR
‡
–7 7 V
Differential input voltage, V
ID
‡
–12 12 V
Voltage-converter filter capacitance 22 µF
Voltage-converter filter-capacitor equivalent series resistance (ESR) 2 Ω
Operating free-air temperature, T
A
0 70
°C
‡
The algebraic convention, in which the less-positive (more negative) limit is designated minimum, is used in this data sheet.
SN75LBC775
SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER
SLLS216A – MA Y 1995 – REVISED JANUARY 1996
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
POST OFFICE BOX 1443
• HOUSTON, TEXAS 77251–1443
DRIVER
electrical characteristics over recommend operating characteristics (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP†MAX UNIT
V
OH
High-level output voltage
3.7 V
V
OL
Low-level output voltage
Single ended
R
L
= 3 kΩ,
See Figure 1
–3.7 V
|VOD| Magnitude of differential output voltage (VDY – VDZ) See Figure 2 4.0 5.6 V
∆|VOD| Change in differential voltage magnitude See Figure 2 10 250 mV
V
OC
Common-mode output voltage
‡
See Figure 3 –1 3 V
∆V
OC(SS)
Change in steady-state common-mode output voltage See Figure 3 ±200 mV
I
OZ
High-impedance output current VCC = 0, –10 V ≤ VO ≤ 10 V ±100 µA
I
OS
Short-circuit output current –5 V ≤VO ≤5 V 450 mA
I
CC
Supply current
DEN at 0 V, REN at 5 V,
No load
5 10 mA
I
IH
High-level input current VI = 5 V 200 µA
p
All terminals except REN
–100 –200 µA
IILlow-level input current
REN
V
I
=
0
–300 –455 µA
†
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 TEST CONDITIONS MIN TYP MAX UNIT
p
Single ended 155 300 ns
t
PHL
Propagation delay time, high- to low-level
Differential 115 180 ns
p
Single ended 140 300 ns
t
PLH
Propagation delay time, lo
w- to
high-level
Differential 115 180 ns
t
PZL
Propagation delay time, high-impedance to low-level output 100 250 ns
t
PZH
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
See Figures 1 and 2
100 250 ns
Single ended 135 300 ns
trRise time
Differential 90 180 ns
Single ended 145 300 ns
tfFall time
Differential 95 180 ns
Single ended 15 50 ns
t
sk(p
)
Pulse skew, |t
PLH
-
t
PHL
|
Differential 2 22 ns
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