SN74FB1653 Datasheet, PDF (2/12 Pages) Texas Instruments – 17-BIT LVTTL/BTL UNIVERSAL STORAGE TRANSCEIVER WITH BUFFERED CLOCK LINE

SN74FB1653
17ĆBIT LVTTL/BTL UNIVERSAL STORAGE TRANSCEIVER
WITH BUFFERED CLOCK LINE
SCBS702H − AUGUST 1997 − REVISED MARCH 2004
description/ordering information
The SN74FB1653 contains an 8-bit and a 9-bit transceiver with a buffered clock. The clock and transceivers
are designed to translate signals between LVTTL and BTL environments. The device is designed specifically
to be compatible with IEEE Std 1194.1-1991 (BTL).
The A port operates at LVTTL signal levels. 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(5 V) typically is less than 2.5 V, the A outputs
are in the high-impedance state.
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 low, OEB is high, or V_CC(5 V) typically
is less than 2.5 V, the B port is turned off.
The clock-select (2SEL1 and 2SEL2) inputs are used to configure the TTL-to-BTL clock paths and delays (refer
to the MUX-MODE DELAY table).
BIAS V_CC establishes a voltage between 1.62 V and 2.1 V on the BTL outputs when V_CC(5 V) is not connected.
BG V_CC and BG GND are the supply inputs for the bias generator.
V_REF is an internally generated voltage source. It is recommended that V_REF be decoupled with an external
0.1-µF capacitor.
Enhanced heat-dissipation techniques should be used when operating this device from AI to A0 at frequencies
greater than 50 MHz, or from AI to B or B to A0 at frequencies greater than 100 MHz.
ORDERING INFORMATION
TA
PACKAGE†
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
0°C to 70°C TQFP − PCA Tube SN74FB1653PCA FB1653
† _{Package drawings, standard packing quantities, thermal data, symbolization, and}
PCB design guidelines are available at www.ti.com/sc/package.
OEA
X
L
L
X
X
H
X
Function Tables
INPUTS
OEA OEB
X
H
H
X
H
H
X
L
X
X
X
X
L
X
TRANSCEIVER
OEB
L
X
L
X
H
X
X
FUNCTION
A data to B bus
B data to A bus
A data to B bus, B data to A bus
B-bus isolation
A-bus isolation
STORAGE MODE
INPUTS
LE CLK
FUNCTION
H
X
Transparent
L
↑
Store data
L
L
Storage
2
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