TI SN75LBC771DW

SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
D
D
D
D
D
D
D
D
D
D
Supports a 9-Pin GeoPort Host Interface
Standard for the Intelligent Network Port
Designed to Operate up to 4-Mbit/s Full
Duplex
± 5 V Supply Operation
Provides 6 kV ESD Protection
Has Driver Short-Circuit Protection
Includes Failsafe Mechanism for Open
Inputs
Is Backward Compatible with AppleTalk
and LocalTalk
Combines Multiple Components into a
Single Chip Solution
Complements the SN75LBC772 9-Pin
GeoPort Peripheral (DCE) Interface Device
Uses LinBiCMOS Process Technology
DW PACKAGE
(TOP VIEW)
DA1
VEE
NC
NC
SHDN
DZ2
DY2
GND
DEN
DA2
DEN
The SN75LBC771 is a low-power LinBiCMOS
device that incorporates the drivers and receivers
for a 9-pin GeoPort host interface. GeoPort
combines hybrid EIA/TIA-422-B and EIA/
TIA-423-B drivers and receivers to transmit data
up to four-Mbit/s full duplex. GeoPort is a serial
communications standard that is intended to
replace the RS-232, AppleTalk, and printer ports
all in one connector in addition to providing
real-time
data
transfer
capability.
The
SN75LBC771 provides point-to-point connections between GeoPort-compatible devices with
data transmission rates up to 4-Mbit/s full duplex
featuring a hot-plug capability. Applications
include connection to telephone, ISDN, digital
sound and imaging, fax-data modems, and other
traditional serial and parallel connections. The
GeoPort is backwardly compatible to both
LocalTalk and AppleTalk.
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
GND
VCC
DY1
RY3
RB3
RA2
RY2
RB1
RA1
RY1
logic diagram (positive logic)
DA2
description
1
RY1
DA1
7
10
6
9
11
1
14
RY3
17
SHDN
DZ2
12
RA1
13
RB1
18
15
RY2
DY2
16
DY1
RA2
RB3
5
While the SN75LBC771 is powered off (VCC and VEE = 0 ), the outputs are in a high-impedance state. Also, when
the shutdown (SHDN) terminal is high, all outputs go into a high-impedance state. A logic high on the driver
enable (DEN) terminal places the outputs of the differential driver into a high-impedance state. All drivers and
receivers have fail-safe mechanisms that ensure a high output state when the inputs are left open.
The SN75LBC771 is characterized for operation over the 0°C to 70°C temperature range.
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.
GeoPort, LocalTalk, and AppleTalk are trademarks of Apple Computer, Incorporated.
LinBICMOS is a trademark of Texas Instruments Incorporated.
Copyright  1997, 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.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
1
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
FUNCTION TABLES†
DIFFERENTIAL DRIVER
SINGLE-ENDED DRIVER
INPUT
(DA1)
ENABLE
(SHDN)
OUTPUT
(DY1)
INPUT
(DA2)
ENABLE
(SHDN) (DEN)
H
L
OPEN
X
X
L
L
L
H
OPEN
L
H
L
Z
Z
H
L
OPEN
X
X
X
X
L
L
L
H
OPEN
X
X
SINGLED-ENDED RECEIVER
OUTPUT
(DY2) (DZ2)
L
L
L
X
X
H
OPEN
H
L
H
Z
Z
Z
Z
L
H
L
Z
Z
Z
Z
DIFFERENTIAL RECEIVER
INPUT
(RA2, RA3)
ENABLE
(SHDN)
OUTPUT
(RY2) (RY3)
INPUT
(RA1) (RB1)
ENABLE
(SHDN)
OUTPUT
(RY1)
H
L
H
L
H
L
L
L
H
L
L
L
H
H
L
L
OPEN
SHORT‡
L
H
H
L
?
?
OPEN
SHORT‡
L
H
L
X
H
Z
?
Z
X
X
H
Z
X
OPEN
Z
Z
X
X
OPEN
Z
† H = high level, L = low level, X = irrelevant, ? = indeterminate, Z = high impedance (off)
‡ –0.2 V < VID < 0.2 V
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)§
Positive supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 to 7 V
Negative supply voltage range, VEE (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 7 to 0.5 V
Receiver input voltage range (RA, RB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 15 V to 15 V
Receiver differential input voltage range, VID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 12 V to 12 V
Receiver output voltage range (RY) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to 5.5 V
Driver output voltage range (Power Off) (DY1, DY2, DZ2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 15 V to 15 V
Driver output voltage range (Power On) (DY1, DY2, DZ2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 11 V to 11 V
Driver input voltage range (DA, SHDN, DEN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 0.5 V to VCC +0.4 V
Electrostatic Discharge (see Note 2)
(All pins) Class 3, A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 kV
(All pins) Class 3, B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 V
Continuous total power dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table
Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C
Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . – 65°C to 150°C
Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°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 rating is per MIL-STD-883C, Method 3015.7.
2
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
DISSIPATION RATING TABLE
PACKAGE
TA ≤ 25°C
POWER RATING
DERATING FACTOR
ABOVE TA = 25°C
TA = 70°C
POWER RATING
DW
1125 mW
9.0 mW/°C
720 mW
recommended operating conditions
Positive supply voltage, VCC
Negative supply voltage, VEE
High-level input voltage, VIH
(DA, SHDN, DEN)
Low-level input voltage, VIL
(DA, SHDN, DEN)
MIN
NOM
MAX
UNIT
4.75
5
5.25
V
– 5.25
–5
– 4.75
V
2
Receiver common-mode input voltage, VIC
Receiver differential input voltage, VID
Operating free-air temperature, TA
V
0.8
V
–7
7
V
–12
12
V
0
70
°C
driver electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
VOH
High level output voltage
High-level
VOL
Low level output voltage
Low-level
|VOD|
Magnitude of differential output voltage
|VDY – VDZ|
∆|VOD|
Change in differential voltage magnitude
VOC
Common-mode output voltage
|∆VOC(SS)|
Magnitude of change, common-mode
steady-state output voltage
|∆VOC(PP)|
Magnitude of change, common-mode
peak-to-peak output voltage
Single-ended,
g
,
See Figure 1
ICC
IEE
Positive supply current
ICC
IEE
Positive supply current
IOZ
High-impedance output current
IOS
Negative supply current
Negative supply current
Short-circuit output current
MIN
TYP
RL= 12 kΩ
3.6
4.5
MAX
UNIT
V
RL= 120 Ω
2
3.6
V
RL= 12 kΩ
– 4.5
–3.6
V
RL = 120 Ω
–3.6
–2
V
RL = 120 Ω,,
g
See Figure
2
4
V
250
–2
2
200
See Figure 3
700
SHDN = DEN = 0 V,
V
No Load
SHDN = DEN = 5 V,
V
No Load
VCC = 0 or 5 V,
VCC = 5.25 V,
See Note 3
–10 ≤ VO ≤ 10 V
–5 V ≤ VO ≤ 5 V,
4
–2
±170
mV
V
mV
mV
10
mA
–5
mA
100
µA
– 100
µA
±100
µA
± 450
mA
NOTE 3: Not more than one output should be shorted at one time.
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
3
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
driver switching characteristics over operating free-air temperature range
TYP
MAX
tPHL
tPLH
Propagation delay time, high-to-low level output
PARAMETER
TEST CONDITIONS
42
75
Propagation delay time, low-to-high level output
41
75
ns
tPZL
tPZH
Driver output enable time to low-level output
25
100
µs
25
100
µs
tPLZ
tPHZ
Driver output disable time from low-level output
28
100
ns
37
100
ns
tr
tf
Rise time
10
25
75
ns
Fall time
10
23
75
ns
tPHL
tPLH
Propagation delay time, high-to-low level output
40
75
ns
Driver output enable time to high-level output
Single
g ended,,
See Figure 4
Driver output disable time from high-level output
Propagation delay time, low-to-high level output
tPZL
Driver output enable time to low-level
low level output
tPZH
Driver output enable time to high-level
high level output
tPLZ
SHDN
MIN
low level output
Driver output disable time from low-level
UNIT
ns
42
75
ns
SHDN
25
100
µs
DEN
29
150
ns
SHDN
25
100
µs
DEN
35
150
ns
28
100
ns
DEN
34
100
ns
SHDN
37
100
ns
SHDN
Differential,,
See Figure 5
tPHZ
Driver output disable time from high-level
high level output
34
100
ns
tr
tf
Rise time
10
27
75
ns
Fall time
10
26
75
ns
tSK(p)
Pulse skew, |tPLH – tPHL|
22
ns
4
DEN
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
receiver electrical characteristics over recommended operating conditions (unless otherwise
noted)
PARAMETER
TEST CONDITIONS
VIT+
VIT–
Positive-going input threshold voltage
Vhys
Differential input voltage hysteresis (VIT+ – VIT–)
See Figure 6
Negative-going input threshold voltage
MIN
TYP
MAX
UNIT
200
mV
–200
VOH
High-level output voltage (see Note 4)
VIC = 0,
See Figure 6
VOL
Low-level output voltage
VIC = 0,
See Figure 6
IOS
Short circuit output current
Short-circuit
VO = 0
VO = 5.25 V
RIN
Input resistance
VCC = 0 or 5.25 V,
IOH = –2 mA,
IOL = 2 mA,
–12 V ≤ VI ≤ 12 V
2
6
mV
50
mV
4.5
V
0.4
0.8
V
– 45
– 85
mA
45
85
mA
30
kΩ
NOTE 4: If the inputs are left unconnected, receivers one and two interpret this as a high-level input and receiver three interprets this as a low-level
input so that all outputs are at the high level.
receiver switching characteristics over recommended conditions (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
tPHL
tPLH
Propagation delay time, high-to-low level output
30
75
ns
Propagation delay time, low-to-high level output
30
75
ns
tr
tf
Rise time
15
30
ns
15
30
ns
tSK(P)
tPZL
Pulse skew |tPLH-tPHL|
20
ns
Receiver output enable time to low-level output
35
100
ns
tPZH
Receiver output enable time to high-level output
35
100
ns
tPLZ
Receiver output disable time from low-level
output
20
100
ns
tPHZ
Receiver output disable time from high-level
output
20
100
ns
12
25
ns
12
25
µs
25
100
µs
125
400
ns
tPZL
tPZH
RL = 2 kΩ,
kΩ
See Figure 6
CL = 15 pF,
F
Fall time
Differential
pF
CL = 50 pF,
Receiver output enable time to low-level output
Receiver output enable time to high-level output
tPLZ
Receiver output disable time from low-level
output
tPHZ
Receiver output disable time from high-level
output
Single-ended
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
See Figure 7
5
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
PARAMETER MEASUREMENT INFORMATION
CL
IO
CL
II
IO
DY1
II
DA1
VO
CL
DA2
RL
VI
RL
DY2
VO
VI
SHDN
IO
DZ2
RL
VO
SHDN
or
DEN
NOTE A: CL = 50 pF
Figure 1. Single-Ended Driver DC Parameter Test Circuits
60 Ω
DY2
II
IO
VOD
DA2
VI
60 Ω
DZ2
50 pF
SHDN
or
DEN
Figure 2. Differential Driver DC Parameter Test Circuit
60 Ω
DY2
VOD
DA2
VI
60 Ω
DZ2
VOC
15 pF
SHDN
or
DEN
TEST CIRCUIT
3V
VI
1.5 v
1.5 v
0V
VOC
0V
V
VOC(PP) OC(SS)
VOLTAGE WAVEFORM
NOTE A: Measured 3dB Bandwidth = 300 MHz
Figure 3. Differential Driver Common-Mode Output Voltage Test Circuit
6
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
PARAMETER MEASUREMENT INFORMATION
CL
IO
CL = 50 pF
II
DY1
DA1
RL
DY2
VO
CL
DA2
RL = 120 Ω
VO
VI
SHDN
IO
DZ2
RL
VO
SHDN
or
DEN
TEST CIRCUIT
(see Note A)
3V
SHDN
or
DEN
1.5 V
1.5 V
1.5 V
1.5 V
0V
3V
1.5 V
DA
1.5 V
0V
tPLH
tPHL
tPLZ
tPZL
90%
DY1, DZ2
10%
tPHZ
90%
90%
50%
10%
10%
90%
0V
50%
10%
VOL
tPZH
tf
tPLZ
tr
tPHL
tPHZ
tPLH
VOH
tPZH
DY2
90%
90%
tPZL
90%
50%
10%
10%
VOH
90%
50%
10%
0V
10%
VOL
tf
tr
VOLTAGE WAVEFORM
(see Note B)
NOTES: A. CL = 50 pF, RL = 120 Ω
B. The input waveform tr, tf ≤ 10 ns.
Figure 4. Single-Ended Driver Propagation and Transition Times Test Circuits and Waveform
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
7
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
PARAMETER MEASUREMENT INFORMATION
RL = 60 Ω
DY2
VOD
DA2
VI
RL = 60 Ω
DZ2
50 pF
SHDN
or
DEN
TEST CIRCUIT
3V
SHDN
or
DEN
1.5 V
1.5 V
1.5 V
1.5 V
0V
3V
1.5 V
DA
1.5 V
0V
tPHL
tPLH
tPHZ
tPZH
90%
VOD
90%
VOD(H)
90%
50%
90%
tPLZ
10%
50%
10%
0V
10%
10%
tPZL
VOD(L)
tf
tr
VOLTAGE WAVEFORM
(see Note A)
NOTE A: For the input waveform tr, tf < = 10 ns
Figure 5. Differential Driver Propagation and Transition Times Test Circuit and Waveforms
VCC
II
Input
VI
2.5 V
VI
2 kΩ
RA +
RB _
RY
15 pF
0V
0V
– 2.5 V
IO
tPLH
Output
VO
SHDN
VO
tPHL
90%
90%
10%
tr
TEST CIRCUIT
VOH
1.5 V
10% V
OL
tf
VOLTAGE WAVEFORM
(see Note A)
NOTE A: For the input waveform tr, tf < = 10 ns
Figure 6. Receiver Propagation and Transition Times Test Circuit and Waveform
8
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
PARAMETER MEASUREMENT INFORMATION
VCC
RA +
RB _
– 2.5 V or 2.5 V
RL = 500 Ω
RY
S1
CL = 50 pF
SHDN
TEST CIRCUIT
3V
SHDN
1.5 V
1.5 V
0V
tPLZ
tPZL
VCC
S1 at VCC
90%
10%
VO
tPHZ
VOL
tPZH
VOH
90%
S1 at GND
10%
0V
VOLTAGE WAVEFORM
(see Note A)
NOTE A: For the input waveform tr, tf < = 10 ns
Figure 7. Receiver Enable and Disable Test Circuit and Waveforms
POST OFFICE BOX 655303
• DALLAS, TEXAS 75265
9
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
APPLICATION INFORMATION
RxD
TxD
SHDN
GeoPort
Controller
and USART†
DTR
RTXC
CTS
RTS
VCC
11
10
13
RxD –
12
RxD +
7
6
TxD +
1 RESET/ATT
14 SCLK
17 TxHS/WAKE-UP
9
18
15
RESET/ATT
SCLK
16
TxHS/WAKE-UP
Power
13
RxD –
12
RxD +
16 TxHS/WAKE-UP
7
TxD +
6
TxD –
6
3
GND
8
20
GeoPort
Peripheral
Device
9-Pin
DCE
TxD –
GND
5
Standard
Host
19
SN75LBC771
9-Pin
DTE
2
VEE
GeoPort
Host
SN75LBC771
9-Pin
DTE
18
RESET/ATT
15
SCLK
7
VCC
8
4
9
1
2
5
Power
† USART = universal synchronous asynchronous receiver transmitter
Figure 8. GeoPort 9-Pin DTE Connection Application
generator characteristics
PARAMETER
TEST CONDITIONS
232/V.28
MIN
Open circuit
|VO|
Output voltage magnitude
IOS
R(OFF)
Short-circuit output current
IO(OFF)
SR
3 kΩ ≤ RL ≤ 7 kΩ
RL = 450 Ω
Power-off source resistance
|VO| < 2 V
300
Power-off output current
VCC = 0,
|VO| < 6 V
NA
Output transition time
25
4
6
15
NA
3.7
3.6
NA
±100
NA
±3 V to ±3 V
10% to 90%
POST OFFICE BOX 655303
0.04
MAX
13.2
UNIT
V
V
V
60
mA
300
Ω
NA
µA
NA
4
30
V/µs
NA
0.22
2.1
NA
NA
µs
ui‡
ui‡
NA
0.3
NA
10%
• DALLAS, TEXAS 75265
MIN
150
NA
30
VO(RING) Output voltage ring
‡ ui is the unit interval and is the inverse of the signaling rate (bit time).
10
MAX
100
Output voltage slew rate
562
MIN
NA
VO = 0
VCC = 0,
±3.3 V to ±3.3 V
tt
5
423/V.10
MAX
NA
5%
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
APPLICATION INFORMATION
receiver characteristics
PARAMETER
|VI|
TEST CONDITIONS
232/V.28
MIN
Input voltage
VIT
Input voltage threshold
RI
Input resistance
423/V.10
MAX
MIN
25
|VI| < 15 V
–3
|VI| < 10 V
NA
3 V < |VI| < 15 V
|VI| < 10 V
POST OFFICE BOX 655303
3
NA
• DALLAS, TEXAS 75265
3
MIN
10
NA
– 0.2
7
562
MAX
–3
0.2
MAX
25
V
3
V
NA
NA
3
4
NA
UNIT
V
7
kΩ
kΩ
11
SN75LBC771
GEOPORT TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
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 03/95
NOTES: A.
B.
C.
D.
12
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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• DALLAS, TEXAS 75265
IMPORTANT NOTICE
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
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CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
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In order to minimize risks associated with the customer’s applications, adequate design and operating
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Copyright  1998, Texas Instruments Incorporated