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參數(shù)資料
| 型號： | 933713990652 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 鎖存器 |
| 英文描述： | HCT SERIES, POSITIVE EDGE TRIGGERED D FLIP-FLOP, TRUE OUTPUT, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁數(shù)： | 2/7頁 |
| 文件大小： | 59K |
| 代理商： | 933713990652 |
December 1990
2
Philips Semiconductors
Product specication
Octal D-type ip-op with data enable;
positive-edge trigger
74HC/HCT377
FEATURES
Ideal for addressable register applications
Data enable for address and data synchronization
applications
Eight positive-edge triggered D-type flip-flops
See “273” for master reset version
See “373” for transparent latch version
See “374” for 3-state version
Output capability: standard
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT377 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/HCT377 have eight edge-triggered, D-type
flip-flops with individual D inputs and Q outputs. A common
clock (CP) input loads all flip-flops simultaneously when
the data enable (E) is LOW. The state of each D input, one
set-up time before the LOW-to-HIGH clock transition, is
transferred to the corresponding output (Qn) of the flip-flop.
The E input must be stable only one set-up time prior to the
LOW-to-HIGH transition for predictable operation.
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
13
14
ns
fmax
maximum clock frequency
77
53
MHz
CI
input capacitance
3.5
pF
CPD
power dissipation capacitance per ip-op
notes 1 and 2
20
pF
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