HEF4521BT NXP Semiconductors, HEF4521BT Datasheet - Page 3

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

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

Philips Semiconductors
FUNCTIONAL TEST SEQUENCE
A test function has been included for the reduction of the
test time required to exercise all 24 counter stages. This
test function divides the counter into three 8-stage
sections by connecting V
I
the 8-stage sections in parallel. All flip-flops are now at a
HIGH state.
January 1995
2
HEF4521BP(N): 16-lead DIL; plastic (SOT38-1)
HEF4521BD(F): 16-lead DIL; ceramic (cerdip) (SOT74)
HEF4521BT(D): 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
(connected to O
24-stage frequency divider and oscillator
MR
H
L
L
L
L
L
INPUTS
Fig.2 Pinning diagram.
I
H
H
L
L
2
2
) 255 counts are loaded into each of
SS
’ to V
O
L
L
L
L
2
DD
TERMINALS
and V
CONTROL
V
V
V
V
V
V
V
SS
DD
DD
SS
SS
SS
SS
DD
’
’ to V
SS
V
. Via
V
V
V
V
V
V
DD
DD
DD
SS
SS
SS
SS
’
3
COUNT CAPACITY
The counter is now returned to the normal 24-stage in
series configuration by connecting V
V
cause the counter to ripple from an all HIGH state to an all
LOW state.
DD
OUTPUTS
O
. One more pulse is entered into input I
18
OUTPUT
to O
H
H
H
H
L
L
O
O
O
O
O
O
O
18
19
20
21
22
23
24
24
REMARKS
counter is in three 8-stage sections
in parallel mode; I
interconnected (O
counter is reset by MR
255 pulses are clocked into I
(the counter advances on the LOW
to HIGH transition)
V
the input I
V
now made floating and becomes an
output; the device is now in the
2
counter ripples from an all HIGH
state to an all LOW state
24
SS
DD
2
2
2
2
2
2
2
’ is connected to V
mode
’ is connected to V
18
19
20
21
22
23
24
= 262 144
= 524 288
= 1 048 576
= 2 097 152
= 4 194 304
= 8 388 608
= 16 777 216
COUNT CAPACITY
2
is made HIGH
SS
Product specification
’ to V
HEF4521B
2
2
and O
is now input);
2
SS
SS
DD
, which will
and V
; O
2
are
MSI
2
2
is
, O
DD
2
’ to