SN74FB2041A
7-BIT TTL/BTL TRANSCEIVER
SCBS172M 鈥?NOVEMBER 1991 鈥?REVISED MARCH 2002
D
D
D
D
Compatible With IEEE Std 1194.1-1991
(BTL)
TTL A Port, Backplane Transceiver Logic
(BTL) B Port
Open-Collector B-Port Outputs Sink
100 mA
BIAS V
CC
Pin Minimizes Signal Distortion
During Live Insertion or Withdrawal
D
D
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High-Impedance State During Power Up
and Power Down
B-Port Biasing Network Preconditions the
Connector and PC Trace to the BTL
High-Level Voltage
TTL-Input Structures Incorporate Active
Clamping to Aid in Line Termination
RC PACKAGE
(TOP VIEW)
2AO1
1AI1
1AO1
V
CC
BIAS V
CC
1OEA
OEB
1OEB
TCK
V
CC
1
2
3
4
5
6
7
8
9
10
11
12
13
52 51 50 49 48 47 46 45 44 43 42 41 40
TMS
GND
1B1
39
38
37
36
35
34
33
32
31
30
29
28
27
GND
2AI1
2AI2
2AO2
GND
2AO3
GND
2AI3
3AI1
3AO1
GND
3AO2
GND
14 15 16 17 18 19 20 21 22 23 24 25 26
GND
2B1
GND
2B2
GND
2B3
GND
3B1
GND
3B2
GND
3B3
GND
3AI2
GND
3AO3
BG V
CC
3AI3
BG GND
2OEA
TDO
TDI
V
CC
3OEA
2OEB
description
The SN74FB2041A is a 7-bit transceiver designed to translate signals between TTL and backplane transceiver
logic (BTL) environments. The device is specifically designed to be compatible with IEEE Std 1194.1-1991.
The B port operates at BTL signal levels. The open-collector B ports are specified to sink 100 mA. Two output
enables (OEB and OEB) are provided for the B outputs. When OEB is high and OEB is low, the B port is active
and reflects the inverse of the data present at the A-input pins. When OEB is low, OEB is high, or V
CC
is less
than 2.1 V, the B port is turned off. The enable/disable logic partitions the device as two 3-bit sections and one
1-bit section.
The A port operates at TTL signal levels and has split input and output pins. The A outputs reflect the inverse
of the data at the B port when the A-port output enable (OEA) is high. When OEA is low or when V
CC
is less
than 2.1 V, the A outputs are in the high-impedance state.
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.
Copyright
錚?/div>
2002, 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
鈥?/div>
DALLAS, TEXAS 75265
3OEB
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