DS1123L
3.3V, 8-Bit, Programmable Timing Element
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Application Information
Power-Supply Decoupling
To achieve the best results when using the DS1123L,
decouple the power supply with a 0.01µF and a 0.1µF
capacitor. Use high-quality, ceramic, surface-mount
capacitors, and mount the capacitors as close as possi-
ble to the V
CC
and GND pins of the DS1123L to mini-
mize lead inductance. The DS1123L may not perform as
specified if good decoupling practices are not followed.
Unused Inputs When Using the Serial-
Programming Mode
When using the serial-programming mode, the unused
parallel inputs must be connected to V
CC
or GND to pre-
vent them from floating and drawing excessive current.
Test Conditions
INPUT:
Ambient Temperature: 25°C ± 3°C
Supply Voltage (V
CC
): 3.3V ± 0.1V
Input Pulse: High = 3.0V ± 0.1V
Low = 0.0V ± 0.1V
Source Impedance: 50Ω (Max)
Rise and Fall Times: 3.0ns (Max) (Measured
Between 0.6V and 2.4V)
Pulse Width: 500ns
Period: 1µs
OUTPUT: The outputs are loaded with a 74F04. Delay
is measured between the 1.5V level of the rising or
falling edge of the input signal and the corresponding
edge of the output signal.
NOTE: Above conditions are for test only and do not
restrict the operation of the device under other data
sheet conditions.
Table 1. DS1123L Delay Line/PWM Ranges and Tolerances
*
This is the maximum delay in normal mode (MS = 0) measured with respect to the reference output, and the maximum pulse width
in monostable vibrator mode (MS = 1).
Table 2. DS1123L Adjustable Oscillator Characteristics
*
Maximum output frequency depends on the actual step-zero delay value. Worst-case values are shown in the table. Output period
is equal to 2 x tD, where tD = delay value referenced to IN.
