INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
∙The IC04 LOCMOS HE4000B Logic Family Specifications HEF, HEC
∙The IC04 LOCMOS HE4000B Logic Package Outlines/Information HEF, HEC
HEF4520B
MSI
Dual binary counter
Product specification |
|
January 1995 |
|||||
File under Integrated Circuits, IC04 |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Philips Semiconductors |
Product specification |
|
|
Dual binary counter
HEF4520B
MSI
DESCRIPTION
The HEF4520B is a dual 4-bit internally synchronous binary counter. The counter has an active HIGH clock input (CP0) and an active LOW clock input (CP1), buffered outputs from all four bit positions (O0 to O3) and an active HIGH overriding asynchronous master reset input (MR). The counter advances on either the LOW to HIGH transition of the CP0 input if CP1 is HIGH or the HIGH to
Fig.1 Functional diagram.
LOW transition of the CP1 input if CP0 is low. Either CP0 or
CP1 may be used as the clock input to the counter and the other clock input may be used as a clock enable input. A HIGH on MR resets the counter (O0 to O3 = LOW)
independent of CP0, CP1.
Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times.
Fig.2 Pinning diagram.
HEF4520BP(N): 16-lead DIL; plastic
(SOT38-1)
HEF4520BD(F): 16-lead DIL; ceramic (cerdip)
(SOT74)
HEF4520BT(D): 16-lead SO; plastic (SOT109-1)
(SOT109-1)
( ): Package Designator North America
PINNING |
|
||||
|
CP0A, CP0B |
clock inputs (L to H triggered) |
|||
|
|
|
1B |
clock inputs (H to L triggered) |
|
|
CP |
1A, |
CP |
||
|
MRA, MRB |
master reset inputs |
|||
|
O0A to O3A |
outputs |
|||
|
O0B to O3B |
outputs |
|||
FAMILY DATA, IDD LIMITS category MSI
See Family Specifications
January 1995 |
2 |
_
1995 January
Fig.3 Logic diagram (one counter).
|
FUNCTION TABLE |
|
|
||||
3 |
|
|
|
|
|
|
|
|
CP0 |
|
CP |
1 |
|
MR |
MODE |
|
|
|
|
|
|
|
|
|
|
|
H |
|
L |
counter advances |
|
|
L |
|
|
|
|
L |
counter advances |
|
|
|
|
|
|||
|
|
|
X |
|
L |
no change |
|
|
|
|
|
||||
|
X |
|
|
|
|
L |
no change |
|
|
|
|
|
|||
|
|
|
L |
|
L |
no change |
|
|
|
|
|
||||
|
H |
|
|
|
|
L |
no change |
|
|
|
|
|
|||
|
|
|
|
|
|
|
|
|
X |
|
X |
|
H |
O0 to O3 = LOW |
|
|
Notes |
|
|
|
|
|
|
1.H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial
= positive-going transition
= negative-going transition
counter binary Dual
HEF4520B MSI
Semiconductors Philips
specification Product
Loading...