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74HC640D-74HCT640D-74HCT640DB
74HC/HCT640; Octal bus transceiver; 3-state; inverting
Philips Semiconductors Product specification
Octal bus transceiver; 3-state; inverting 74HC/HCT640
FEATURES Octal bidirectional bus interface Inverting 3-state outputs Output capability: bus driver ICC category: MSI
GENERAL DESCRIPTIONThe 74HC/HCT640 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT640 are octal transceivers featuring
inverting 3-state bus compatible outputs in both send and
receive directions.
The “640” features an output enable (OE) input for easy
cascading and a send/receive (DIR) for direction control. controls the outputs so that the buses are effectively
isolated. The “640” is similar to the “245” but has inverting
outputs.
QUICK REFERENCE DATAGND=0 V; Tamb =25 °C; tr =tf =6ns
Notes CPD is used to determine the dynamic power dissipation (PD in μW): =CPD× VCC2×fi+ ∑ (CL× VCC2× fo) where:= input frequency in MHz= output frequency in MHz (CL× VCC2× fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC− 1.5V
ORDERING INFORMATIONSee “74HC/HCT/HCU/HCMOS Logic Package Information”.
Philips Semiconductors Product specification
Octal bus transceiver; 3-state; inverting 74HC/HCT640
PIN DESCRIPTION
FUNCTION TABLE
Note H= HIGH voltage level= LOW voltage level= don’t care = high impedance OFF-state
Philips Semiconductors Product specification
Octal bus transceiver; 3-state; inverting 74HC/HCT640
DC CHARACTERISTICS FOR 74HCFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HCGND=0 V; tr =tf=6 ns; CL =50pF
Philips Semiconductors Product specification
Octal bus transceiver; 3-state; inverting 74HC/HCT640
DC CHARACTERISTICS FOR 74HCTFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Output capability: bus driver
ICC category: MSI
Note to HCT typesThe value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCTGND=0 V; tr =tf=6 ns; CL =50pF
Philips Semiconductors Product specification
Octal bus transceiver; 3-state; inverting 74HC/HCT640
AC WAVEFORMS
PACKAGE OUTLINESSee “74HC/HCT/HCU/HCMOS Logic Package Outlines”.
