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SN74FB2033A датащи(PDF) 2 Page - Texas Instruments

номер детали SN74FB2033A
подробное описание детали  8-BIT TTL/BTL REGISTERED TRANSCEIVER
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производитель  TI1 [Texas Instruments]
домашняя страница  http://www.ti.com
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SN74FB2033A
8-BIT TTL/BTL REGISTERED TRANSCEIVER
SCBS174M – NOVEMBER 1991 – REVISED SEPTEMBER 2001
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
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 (prior to 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, OEB is high, or 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 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
PART NUMBER
TOP-SIDE
MARKING
0
°C to 70°C QFP – RC
Tube
SN74FB2033ARC
FB2033A
† Package drawings, standard packing quantities, thermal data,
symbolization,
and
PCB
design
guidelines
are
available
at
www.ti.com/sc/package.


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