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Hitachi Semiconductor - 18-bit Universal Bus Transceivers with 3-state Outputs

Numéro de référence HD74ALVCH162501
Description 18-bit Universal Bus Transceivers with 3-state Outputs
Fabricant Hitachi Semiconductor 
Logo Hitachi Semiconductor 





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HD74ALVCH162501 fiche technique
HD74ALVCH162501
18-bit Universal Bus Transceivers with 3-state Outputs
ADE-205-182 (Z)
Preliminary
1st. Edition
December 1996
Description
Data flow in each direction is controlled by output enable (OEAB and OEBA), latch enable (LEAB
and LEBA), and clock (CLKAB and CLKBA) inputs. For A to B data flow, the device operates in the
transparent mode when LEAB is high. When LEAB is low, the A data is latched if CLKAB is held at
a high or low logic level. If LEAB is low, the A bus data is stored in the latch flip flop on the low to
high transition of CLKAB. When OEAB is high, the outputs are active. When OEAB is low, the
outputs are in the high impedance state. Data flow for B to A is similar to that of A to B but uses
OEBA, LEBA, and CLKBA. The output enables are complementary (OEAB is active high, and
OEBA is active low). Active bus hold circuitry is provided to hold unused or floating data inputs at a
valid logic level. All outputs, which are designed to sink up to 12 mA, include 26 resistors to reduce
overshoot and undershoot.
Features
VCC = 2.3 V to 3.6 V
Typical VOL ground bounce < 0.8 V (@VCC = 3.3 V, Ta = 25°C)
Typical VOH undershoot > 2.0 V (@VCC = 3.3 V, Ta = 25°C)
High output current ±12 mA (@VCC = 3.0 V)
Bus hold on data inputs eliminates the need for external pullup / pulldown resistors
All outputs have equivalent 26 series resistors, so no external resistors are required.

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