參數(shù)資料
型號： 935190120112
廠商： NXP SEMICONDUCTORS
元件分類： 總線收發(fā)器
英文描述： HCT SERIES, OCTAL 1-BIT DRIVER, INVERTED OUTPUT, PDSO20
封裝： PLASTIC, SSOP-20
文件頁數(shù)： 2/7頁
文件大?。?/td> 51K
代理商： 935190120112
December 1990
2
Philips Semiconductors
Product specication
Octal buffer/line driver; 3-state;
inverting
74HC/HCT540
FEATURES
Inverting outputs
Output capability: bus driver
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT540 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/HCT540 are octal inverting buffer/line drivers
with 3-state outputs. The 3-state outputs are controlled by
the output enable inputs OE1 and OE2.
A HIGH on OEn causes the outputs to assume a high
impedance OFF-state.
The “540” is identical to the “541” but has inverting outputs.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
Notes
1. CPD is used to determine the dynamic power dissipation (PD in W):
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 Yn
CL = 15 pF; VCC = 5 V
9
11
ns
CI
input capacitance
3.5
pF
CPD
power dissipation capacitance per buffer notes 1 and 2
39
44
pF
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