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74HC643 数据表(PDF) 2 Page - NXP Semiconductors

部件名 74HC643
功能描述  Octal bus transceiver; 3-state; true/inverting
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

74HC643 数据表(HTML) 2 Page - NXP Semiconductors

  74HC643 Datasheet HTML 1Page - NXP Semiconductors 74HC643 Datasheet HTML 2Page - NXP Semiconductors 74HC643 Datasheet HTML 3Page - NXP Semiconductors 74HC643 Datasheet HTML 4Page - NXP Semiconductors 74HC643 Datasheet HTML 5Page - NXP Semiconductors 74HC643 Datasheet HTML 6Page - NXP Semiconductors  
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December 1990
2
Philips Semiconductors
Product specification
Octal bus transceiver; 3-state;
true/inverting
74HC/HCT643
FEATURES
• Octal bidirectional bus interface
• True and inverting 3-state outputs
• Output capability: bus driver
• ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT643 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/HCT643 are octal transceivers featuring true
and inverting 3-state bus compatible outputs in both send
and receive directions.
The “643” 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.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf =6ns
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (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”.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
An to Bn; inverting
Bn to An; true
CL = 15 pF; VCC = 5 V
7
8
8
11
ns
ns
CI
input capacitance
3.5
3.5
pF
CI/O
input/output capacitance
10
10
pF
CPD
power dissipation capacitance per transceiver notes 1 and 2
42
44
pF


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