|
74HC4020 Datasheet, PDF (2/7 Pages) NXP Semiconductors – 14-stage binary ripple counter | |||
|
◁ |
Philips Semiconductors
14-stage binary ripple counter
Product speciï¬cation
74HC/HCT4020
FEATURES
⢠Output capability: standard
⢠ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT4020 are high-speed Si-gate CMOS
devices and are pin compatible with the â4020â of the
â4000Bâ series. They are specified in compliance with
JEDEC standard no. 7A.
The 74HC/HCT4020 are 14-stage binary ripple counters
with a clock input (CP), an overriding asynchronous
master reset input (MR) and twelve fully buffered parallel
outputs (Q0, Q3 to Q13).
The counter is advanced on the HIGH-to-LOW transition of
CP.
A HIGH on MR clears all counter stages and forces all
outputs LOW, independent of the state of CP.
Each counter stage is a static toggle flip-flop.
QUICK REFERENCE DATA
GND = 0 V; Tamb = 25 °C; tr = tf = 6 ns
SYMBOL
PARAMETER
CONDITIONS
tPHL/ tPLH
fmax
CI
CPD
propagation delay
CP to Q0
Qn to Qn+1
MR to Qn
maximum clock frequency
input capacitance
power dissipation capacitance per package
CL = 15 pF; VCC = 5 V
notes 1 and 2
Notes
1. CPD is used to determine the dynamic power dissipation (PD in µW):
PD = CPD Ã VCC2 Ã fi + â (CL Ã VCC2 Ã fo) where:
fi = input frequency in MHz
fo = output frequency in MHz
â (CL Ã VCC2 Ã 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 â 1.5 V
TYPICAL
HC
HCT
UNIT
11
15
6
6
17
19
101
52
3.5
3.5
19
20
ns
ns
ns
MHz
pF
pF
ORDERING INFORMATION
See â74HC/HCT/HCU/HCMOS Logic Package Informationâ.
September 1993
2
|
▷ |