HEF4521BT NXP Semiconductors, HEF4521BT Datasheet - Page 2

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HEF4521BT

Manufacturer Part Number
HEF4521BT
Description
IC, 4000 LOCMOS, SMD, 4521, SOIC16
Manufacturer
NXP Semiconductors
Datasheet

Specifications of HEF4521BT

Clock Frequency
35MHz
Count Maximum
24
Supply Voltage Range
4.5V To 15.5V
Logic Case Style
SOIC
No. Of Pins
16
Operating Temperature Range
-40°C To +70°C
Svhc
No SVHC (18-Jun-2010)
Package /
RoHS Compliant
Base Number
4521
Rohs Compliant
Yes

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DESCRIPTION
The HEF4521B consists of a chain of 24 toggle flip-flops
with an overriding asynchronous master reset input (MR),
and an input circuit that allows three modes of operation.
The single inverting stage (I
oscillator, or in combination with I
as an input buffer for an external oscillator. Low-power
FAMILY DATA, I
See Family Specifications
January 1995
24-stage frequency divider and oscillator
DD
LIMITS category MSI
2
/O
2
) will function as a crystal
1
as an RC oscillator, or
Fig.1 Functional diagram.
2
operation as a crystal oscillator is enabled by connecting
external resistors to pins 3 (V
Each flip-flop divides the frequency of the previous flip-flop
by two, consequently the HEF4521B will count up to
2
LOW transition of the clock (I
seven stages are available for additional flexibility.
24
= 16777216. The counting advances on the HIGH to
2
SS
). The outputs of the last
’) and 5 (V
Product specification
HEF4521B
DD
’).
MSI

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