Controlled Baseline
− One Assembly/Test Site, One Fabrication
Site
Extended Temperature Performance of
−40°C to 125°C
Enhanced Diminishing Manufacturing
Sources (DMS) Support
Enhanced Product-Change Notification
Qualification Pedigree†
Synchronous or Asynchronous Preset
Cascadable in Synchronous or Ripple
Mode
Fanout (Over Temperature Range)
− Standard Outputs . . . 10 LSTTL Loads
− Bus Driver Outputs . . . 15 LSTTL Loads
Balanced Propagation Delay and Transition
Times
Significant Power Reduction Compared to
LSTTL Logic ICs
VCC Voltage = 2 V to 6 V
High Noise Immunity NIL or NIH = 30% of
VCC, VCC = 5 V

description/ordering information
The CD74HC40103 is manufactured with high-speed silicon-gate technology and consists of an 8-stage
synchronous down counter with a single output, which is active when the internal count is zero. The device
contains a single 8-bit binary counter. Each device 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 control inputs and the terminal count (TC) output are active-low logic.
In normal operation, the counter is decremented by one count on each positive transition of the clock (CP)
output. Counting is inhibited when the terminal enable (TE) input is high. TC goes low when the count reaches
zero, if TE is low, and remains low for one full clock period.
When the synchronous preset enable (PE) input is low, data at the P0−P7 inputs are clocked into the counter on
the next positive clock transition, regardless of the state of TE. When the asynchronous preset enable (PL) input
is low, data at the P0−P7 inputs asynchronously are forced into the counter, regardless of the state of the PE, TE,
or CP inputs. Inputs P0−P7 represent a single 8-bit binary word for the CD74HC40103. When the master reset
(MR) input is low, the counter asynchronously is cleared to its maximum count of 25510, regardless of the state of
any other input. The precedence relationship between control inputs is indicated in the truth table.