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參數(shù)資料
| 型號(hào)： | 935175110112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | HCT SERIES, OCTAL 1-BIT DRIVER, TRUE OUTPUT, PDSO20 |
| 封裝： | PLASTIC, SSOP-20 |
| 文件頁(yè)數(shù)： | 2/7頁(yè) |
| 文件大?。?/td> | 56K |
| 代理商： | 935175110112 |
December 1990
2
Philips Semiconductors
Product specication
Octal D-type ip-op; positive
edge-trigger; 3-state
74HC/HCT574
FEATURES
3-state non-inverting outputs for
bus oriented applications
8-bit positive edge-triggered
register
Common 3-state output enable
input
Independent register and 3-state
buffer operation
Output capability: bus driver
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT574 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/HCT574 are octal D-type
flip-flops featuring separate D-type
inputs for each flip-flop and
non-inverting 3-state outputs for bus
oriented applications. A clock (CP)
and an output enable (OE) input are
common to all flip-flops.
The 8 flip-flops will store the state of
their individual D-inputs that meet the
set-up and hold time requirements on
the LOW-to-HIGH CP transition.
When OE is LOW, the contents of the
8 flip-flops are available at the
outputs.
When OE is HIGH, the outputs go to
the high impedance OFF-state.
Operation of the OE input does not
affect the state of the flip-flops.
The “574” is functionally identical to
the “564”, but has non-inverting
outputs.
The “574” is functionally identical to
the “374”, but has a different pinning.
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 CP to Qn
CL = 15 pF; VCC = 5 V
1415ns
fmax
maximum clock frequency
123
76
MHz
CI
input capacitance
3.5
pF
CPD
power dissipation capacitance per flip-flop
notes 1 and 2
22
25
pF
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