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MC14518B_06 Datasheet, PDF (1/9 Pages) ON Semiconductor – Dual Up Counters | |||
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MC14518B, MC14520B
Dual Up Counters
The MC14518B dual BCD counter and the MC14520B dual binary
counter are constructed with MOS Pâchannel and Nâchannel
enhancement mode devices in a single monolithic structure. Each
consists of two identical, independent, internally synchronous 4âstage
counters. The counter stages are type D flipâflops, with interchangeable
Clock and Enable lines for incrementing on either the positiveâgoing or
negativeâgoing transition as required when cascading multiple stages.
Each counter can be cleared by applying a high level on the Reset line.
In addition, the MC14518B will count out of all undefined states within
two clock periods. These complementary MOS up counters find
primary use in multiâstage synchronous or ripple counting applications
requiring low power dissipation and/or high noise immunity.
Features
⢠Diode Protection on All Inputs
⢠Supply Voltage Range = 3.0 Vdc to 18 Vdc
⢠Internally Synchronous for High Internal and External Speeds
⢠Logic EdgeâClocked Design â Incremented on Positive Transition
of Clock or Negative Transition on Enable
⢠Capable of Driving Two Lowâpower TTL Loads or One Lowâpower
Schottky TTL Load Over the Rated Temperature Range
⢠PbâFree Packages are Available*
MAXIMUM RATINGS (Voltages Referenced to VSS) (Note 1.)
Symbol
Parameter
Value
Unit
VDD
DC Supply Voltage Range
â0.5 to +18.0
V
Vin, Vout Input or Output Voltage Range â0.5 to VDD + 0.5
V
(DC or Transient)
Iin, Iout
Input or Output Current
(DC or Transient) per Pin
±10
mA
PD
Power Dissipation,
per Package (Note 2.)
500
mW
TA
Operating Temperature Range
â55 to +125
°C
Tstg
Storage Temperature Range
â65 to +150
°C
TL
Lead Temperature
(8âSecond Soldering)
260
°C
Maximum ratings are those values beyond which device damage can occur.
Maximum ratings applied to the device are individual stress limit values (not
normal operating conditions) and are not valid simultaneously. If these limits are
exceeded, device functional operation is not implied, damage may occur and
reliability may be affected.
1. Maximum Ratings are those values beyond which damage to the device
may occur.
2. Temperature Derating:
Plastic âP and D/DWâ Packages: â 7.0 mW/_C From 65_C To 125_C
This device contains protection circuitry to guard against damage due to high
static voltages or electric fields. However, precautions must be taken to avoid
applications of any voltage higher than maximum rated voltages to this
highâimpedance circuit. For proper operation, Vin and Vout should be constrained
to the range VSS v (Vin or Vout) v VDD.
Unused inputs must always be tied to an appropriate logic voltage level (e.g.,
either VSS or VDD). Unused outputs must be left open.
http://onsemi.com
PDIPâ16
P SUFFIX
CASE 648
MARKING
DIAGRAMS
16
MC145xxBCP
AWLYYWWG
1
16
SOICâ16
DW SUFFIX
CASE 751G
145xxB
AWLYYWWG
SOEIAJâ16
F SUFFIX
CASE 966
1
16
MC145xxB
ALYWG
xx
A
WL, L
YY, Y
WW, W
G
1
= 18 or 20
= Assembly Location
= Wafer Lot
= Year
= Work Week
= PbâFree Indicator
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2006
1
January, 2006 â Rev. 5
Publication Order Number:
MC14518B/D
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