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參數(shù)資料
| 型號： | 935020940112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | HCT SERIES, OCTAL 1-BIT TRANSCEIVER, TRUE OUTPUT, PDSO20 |
| 封裝： | SOT-163, SO-20 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大小： | 42K |
| 代理商： | 935020940112 |
December 1990
2
Philips Semiconductors
Product specication
Octal bus Schmitt-trigger transceiver;
3-state
74HC/HCT7245
FEATURES
Octal bidirectional bus interface
Non-inverting 3-state outputs
Output capability: bus driver
ICC category: MSI
Schmitt-trigger action on all data
inputs
GENERAL DESCRIPTION
The 74HC/HCT7245 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/HCT7245 are octal
transceivers featuring non-inverting
3-state bus compatible outputs in
both send and receive directions. The
“7245” features an output enable
(OE) input for easy cascading and a
send/receive input (DIR) for direction
control. OE controls the outputs so
that the buses are effectively isolated.
The 74HC/HCT7245 have
Schmitt-trigger inputs. These inputs
are capable of transforming slowly
changing input signals into sharply
defined jitter-free output signals.
The “7245” is identical to the “245” but
has hysteresis on the data inputs.
FUNCTION TABLE
Notes
1. H = HIGH voltage level
L = LOW voltage level
X = don’t care
Z = high impedance OFF-state
INPUTS
INPUTS/OUTPUTS
OE
DIR
An
Bn
L
H
L
H
X
A=B
inputs
Z
inputs
B=A
Z
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 Bn
CL = 15 pF; VCC = 5 V
8
12
ns
CI
input capacitance
3.5
pF
CI/O
input/output capacitance
10
pF
CPD
power dissipation capacitance per transceiver
notes 1 and 2
40
pF
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