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SN75LBC775
SINGLE-CHIP APPLETALK™ AND LOCALTALK™ TRANSCEIVER
SLLS216A – MAY 1995 – REVISED JANUARY 1996
D
D
D
D
D
D
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
DW PACKAGE
(TOP VIEW)
HSKA
V
SS
C–
C+
DEN
DY
DZ
GND
V
CC
DA
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
GND
V
CC
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.
While the device power is turned off (V
CC
= 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.
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.
functional diagram
HSKA
1
18
HSKY
6
DA
10
7
DY
DZ
DEN
RY1
5
12
13
14
16
15
RA1
RB1
RA2
RB2
RY2
17
REN
VCC
GND
11
19
8
Charge Pump
2 VSS
–5 V
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.
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
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
•
1
SN75LBC775
SINGLE-CHIP APPLETALK™ AND LOCALTALK™ TRANSCEIVER
SLLS216A – MAY 1995 – REVISED JANUARY 1996
DRIVER FUNCTION TABLE
INPUT
DA
H
L
X
X
OPEN
X
X
H = high level,
HSKA
X
X
H
L
OPEN
X
X
ENABLE
DEN
L
L
L
L
L
H
OPEN
L = low level,
A
H
L
X
X
H
Z
Z
OUTPUT
B
L
H
X
X
L
Z
Z
HSKY
X
X
L
H
L
Z
Z
? = indeterminate,
H
L
RA
RECEIVER FUNCTION TABLE
INPUT
RB
L
H
OPEN
SHORT†
X
† – 0.2 V < VID < 0.2 V
ENABLE
REN
H
H
H
H
L
OUTPUT
RY
H
L
H
?
Z
X = irrelevant,
Z = high impedance (off)
schematics of inputs and outputs
ALL LOGIC INPUTS
VCC
RECEIVER INPUTS
VCC
A Input
Only
24 kΩ
Input
1 kΩ
Input
B Input
Only
5 kΩ
10 kΩ
HSKY OUTPUT
VCC
VCC
DY AND DZ OUTPUTS
RECEIVER OUTPUTS
VCC
Output
DY
Output
DZ
Output
4 kΩ
Output
2
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
•
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, 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
PACKAGE
DW
TA
≤
25°C
POWER RATING
1125 mW
DERATING FACTOR
ABOVE TA = 25°C
9.0 mW/°C
TA = 85°C
POWER RATING
585 mW
recommended operating conditions
MIN
Supply voltage, VCC
High-level input voltage, VIH
Low-level input voltage, VIL
Receiver input common-mode voltage range, VICR‡
Differential input voltage, VID‡
Voltage-converter filter capacitance
Voltage-converter filter-capacitor equivalent series resistance (ESR)
Operating free-air temperature, TA
0
‡ The algebraic convention, in which the less-positive (more negative) limit is designated minimum, is used in this data sheet.
DA, HSKA, DEN, REN
DA, HSKA, DEN, REN
–7
– 12
22
2
70
4.75
2
0.8
7
12
NOM
5
MAX
5.25
UNIT
V
V
V
V
V
µF
Ω
°C
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
•
3
SN75LBC775
SINGLE-CHIP APPLETALK™ AND LOCALTALK™ TRANSCEIVER
SLLS216A – MAY 1995 – REVISED JANUARY 1996
DRIVER
electrical characteristics over recommend operating characteristics (unless otherwise noted)
PARAMETER
VOH
VOL
|VOD|
∆|V
OD|
VOC
∆V
OC(SS)
IOZ
IOS
ICC
IIH
IIL
High-level output voltage
Low-level output voltage
Single ended
TEST CONDITIONS
RL = 3 kΩ
kΩ,
See Figure 2
See Figure 2
See Figure 3
See Figure 3
VCC = 0, –10 V
≤
VO
≤
10 V
– 5 V
≤
VO
≤
5 V
DEN at 0 V,
No load
VI = 5 V
All terminals except REN
VI = 0
– 100
REN at 5 V,
5
–1
See Figure 1
MIN
3.7
– 3.7
4.0
5.6
10
250
3
±
200
±
100
450
10
200
– 200
TYP†
MAX
UNIT
V
V
V
mV
V
mV
µA
mA
mA
µA
µA
µA
Magnitude of differential output voltage (VDY – VDZ)
Change in differential voltage magnitude
Common-mode output voltage‡
Change in steady-state common-mode output voltage
High-impedance output current
Short-circuit output current
Supply current
High-level input current
low-level
low level input current
REN
– 300 – 455
† 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
tPLH
tPZL
tPZH
tPLZ
tPHZ
tr
tf
tsk(p)
Propagation delay time, high- to low-level
time high
low level
Propagation delay time, low- to high-level
time low
high level
Single ended
Differential
Single ended
Differential
TEST CONDITIONS
MIN
TYP
155
115
140
115
100
100
See Figures 1 and 2
100
100
135
90
145
95
15
2
MAX
300
180
300
180
250
250
250
250
300
180
300
180
50
22
UNIT
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Propagation delay time, high-impedance to low-level output
Propagation delay time, high-impedance to high-level output
Propagation delay time, low-level to high-impedance output
Propagation delay time, high-level to high-impedance output
Rise time
Fall time
Pulse skew, |tPLH-tPHL|
skew
Single ended
Differential
Single ended
Differential
Single ended
Differential
4
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
•
•
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