Philips 74HCT640U, 74HCT640N, 74HCT640DB, 74HCT640D, 74HC640U Datasheet
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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
∙The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications
∙The IC06 74HC/HCT/HCU/HCMOS Logic Package Information
∙The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT640
Octal bus transceiver; 3-state; inverting
Product specification |
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March 1988 |
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File under Integrated Circuits, IC06 |
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Philips Semiconductors |
Product specification |
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Octal bus transceiver; 3-state; inverting |
74HC/HCT640 |
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FEATURES
·Octal bidirectional bus interface
·Inverting 3-state outputs
·Output capability: bus driver
·ICC category: MSI
GENERAL DESCRIPTION
The 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. OE controls the outputs so that the buses are effectively isolated. The “640” is similar to the “245” but has inverting outputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL |
PARAMETER |
CONDITIONS |
TYPICAL |
UNIT |
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HC |
HCT |
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tPHL/ tPLH |
propagation delay |
CL = 15 pF; VCC = 5 V |
9 |
9 |
ns |
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An to Bn; |
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Bn to An |
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CI |
input capacitance |
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3.5 |
3.5 |
pF |
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CI/O |
input/output capacitance |
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10 |
10 |
pF |
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CPD |
power dissipation capacitance |
notes 1 and 2 |
35 |
35 |
pF |
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per transceiver
Notes
1. CPD is used to determine the dynamic power dissipation (PD in mW): PD = CPD ´ VCC2 ´ fi + å (CL ´ VCC2 ´ fo) where:
fi = input frequency in MHz fo = output frequency in MHz
å (CL ´ VCC2 ´ fo) = sum of outputs CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC - 1.5 V
ORDERING INFORMATION
See “74HC/HCT/HCU/HCMOS Logic Package Information”.
March 1988 |
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