CD40102BMS
CD40103BMS
CMOS 8-Stage Presettable
Synchronous Down Counters
December 1992
Features
Description
• High Voltage Type (20V Rating)
• CD40102BMS: 2-Decade BCD Type
• CD40103BMS: 8-Bit Binary Type
• Synchronous or Asynchronous Preset
CD40102BMS and CD40103BMS consist of an 8-stage syn-
chronous down counter with a single output which is active
when the internal count is zero. The CD40102BMS is config-
ured as two cascaded 4-bit BCD counters, and the
CD40103BMS contains a single 8-bit binary counter. Each
type has control inputs for enabling or disabling the clock, for
clearing the counter to its maximum count, and for presetting
the counter either synchronously or asynchronously. All con-
trol inputs and the CARRY-OUT/ZERO-DETECT output are
active-low logic.
• Medium Speed Operation
- fCL = 3.6MHz (Typ) at 10V
• Cascadable
• 100% Tested for Quiescent Current at 20V
In normal operation, the counter is decremented by one
count on each positive transition of the CLOCK. Counting is
inhibited when the CARRY-IN/COUNTER ENABLE (CI/CE)
inputs is high. The CARRY-OUT/ZERO-DETECT (CO/ZD)
output goes low when the count reaches zero if the CI/CE
input is low, and remains low for one full clock period.
• Maximum Input Current of 1µA at 18V Over Full Pack-
age Temperature Range; 100nA at 18V and +25oC
• Noise Margin (Over Full Package/Temperature Range)
- 1V at VDD = 5V
- 2V at VDD = 10V
When the SYNCHRONOUS PRESET-ENABLE (SPE) input
is low, data at the JAM input is clocked into the counter on
the next positive clock transition regardless of the state of
the CI/CE input. When the ASYNCHRONOUS PRESET-
ENABLE (APE) input is low, data at the JAM inputs is asyn-
chronously forced into the counter regardless of the state of
the SPE, CI/CE, or CLOCK inputs. JAM inputs J0-J7 repre-
sent two 4-bit BCD words for the CD40102BMS and a single
8-bit binary word for the CD40103BMS.
- 2.5V at VDD = 15V
• Standardized Symmetrical Output Characteristics
• 5V, 10V and 15V Parametric Ratings
• Meets All Requirements of JEDEC Tentative Standard
No. 13B, “Standard Specifications for Description of
‘B’ Series CMOS Devices”
When the CLEAR (CLR) input is low, the counter is asyn-
chronously cleared to its maximum count (9910 for the
CD40102BMS and 25510 for the CD40103BMS) regardless
of the state of any other input. The precedence relationship
between control inputs is indicated in the truth table.
Applications
• Divide-By- “N” Counters
• Programmable Times
• Interrupt Timers
If all control inputs except CI/CE are high at the time of zero
count, the counters will jump to the maximum count, giving a
counting sequence of 100 or 256 clock pulses long.
• Cycle/Program Counter
This causes the CO/ZD output to go low to enable the clock
on each succeeding clock pulse.
Pinout
CD40102BMS, CD40130BMS
The CD40102BMS and CD40103BMS may be cascaded
using the CI/CE input and the CO/ZD output, in either a syn-
chronous or ripple mode as shown in Figures 16 and 17.
TOP VIEW
CLOCK
CLEAR
1
2
3
4
5
6
7
8
16 VDD
The CD40102MS and CD40103BMS are supplied in these
16-lead outline packages:
SYNCHRONOUS
PRESET ENABLE
CARRY OUT/
15
14
CARRY IN/
COUNTER ENABLE
ZERO DETECT
Braze Seal DIP
Frit Seal DIP
Ceramic Flatpack
*CD40102B Only
*H4W †H4X
J0
13 J7
12 J6
11 J5
10 J4
*H1L
H6W
†H1F
J1
J2
†CD40130B Only
J3
9
ASYNCHRONOUS
PRESET ENABLE
VSS
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
File Number 3351
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