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Texas Instruments (TI) Electronic Components Datasheet

SN74FB2033K Datasheet

8-Bit TTL/BTL Registered Transceiver

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SN74FB2033K
8-BIT TTL/BTL REGISTERED TRANSCEIVER
D Compatible With IEEE Std 1194.1-1991
(BTL)
D TTL A Port, Backplane Transceiver Logic
(BTL) B Port
D Open-Collector B-Port Outputs Sink
100 mA
D BIAS VCC Pin Minimizes Signal Distortion
During Live Insertion/Withdrawal
SCBS472G – MAY 1994 – REVISED SEPTEMBER 2001
D High-Impedance State During Power Up
and Power Down
D B-Port Biasing Network Preconditions the
Connector and PC Trace to the BTL
High-Level Voltage
D TTL-Input Structures Incorporate Active
Clamping Networks to Aid in Line
Termination
RC PACKAGE
(TOP VIEW)
GND
AO2
AI3
AO3
AI4
AO4
LOOPBACK
AI5
AO5
AI6
AO6
AI7
GND
52 51 50 49 48 47 46 45 44 43 42 41 40
1 39
2 38
3 37
4 36
5 35
6 34
7 33
8 32
9 31
10 30
11 29
12 28
13 27
14 15 16 17 18 19 20 21 22 23 24 25 26
GND
B2
GND
B3
GND
B4
GND
B5
GND
B6
GND
B7
GND
description
The SN74FB2033K is an 8-bit transceiver featuring a split input (AI) and output (AO) bus on the TTL-level A port.
The common I/O, open-collector B port operates at backplane transceiver logic (BTL) signal levels. The
SN74FB2033K is specifically designed to be compatible with IEEE Std 1194.1-1991.
The logic element for data flow in each direction is configured by two mode inputs (IMODE1 and IMODE0 for
B-to-A, OMODE1 and OMODE0 for A-to-B) as a buffer, a D-type flip-flop, or a D-type latch. When configured
in the buffer mode, the inverted input data appears at the output port. In the flip-flop mode, data is stored on
the rising edge of the appropriate clock input (CLKAB/LEAB or CLKBA/LEBA). In the latch mode, the clock
inputs serve as active-high transparent latch enables.
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.
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
Copyright 2001, Texas Instruments Incorporated
1


Texas Instruments (TI) Electronic Components Datasheet

SN74FB2033K Datasheet

8-Bit TTL/BTL Registered Transceiver

No Preview Available !

SN74FB2033K
8-BIT TTL/BTL REGISTERED TRANSCEIVER
SCBS472G MAY 1994 REVISED SEPTEMBER 2001
description (continued)
Data flow in the B-to-A direction, regardless of the logic element selected, is further controlled by the
LOOPBACK input. When LOOPBACK is low, B-port data is the B-to-A input. When LOOPBACK is high, the
output of the selected A-to-B logic element (before inversion) is the B-to-A input.
The AO port-enable/-disable control is provided by OEA. When OEA is low or when VCC is less than 2.5 V, the
AO port is in the high-impedance state. When OEA is high, the AO port is active (high or low logic levels).
The B port is controlled by OEB and OEB. If OEB is low, or OEB is high, or when VCC is less than 2.5 V, the B port
is inactive. If OEB is high and OEB is low, the B port is active.
BG VCC and BG GND are the bias-generator reference inputs.
The A-to-B and B-to-A logic elements are active, regardless of the state of their associated outputs. The logic
elements can enter new data (in flip-flop and latch modes) or retain previously stored data while the associated
outputs are in the high-impedance (AO port) or inactive (B port) states.
Output clamps are provided on the BTL outputs to reduce switching noise. One clamp reduces inductive ringing
effects on VOH during a low-to-high transition. The other clamps out ringing below the BTL VOL voltage of 0.75 V.
Both of these clamps are active only during ac switching and do not affect the BTL outputs during steady-state
conditions.
BIAS VCC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when VCC is not connected.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE TOP-SIDE
PART NUMBER MARKING
0°C to 70°C QFP RC Tube
SN74FB2033KRC FB2033K
Package drawings, standard packing quantities, thermal data,
symbolization, and PCB design guidelines are available at
www.ti.com/sc/package.
2 POST OFFICE BOX 655303 DALLAS, TEXAS 75265


Part Number SN74FB2033K
Description 8-Bit TTL/BTL Registered Transceiver
Maker Texas
Total Page 14 Pages
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