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PDF UA2240C Data sheet ( Hoja de datos )
| Número de pieza | UA2240C | |
| Descripción | PROGRAMMABLE TIMER/COUNTER | |
| Fabricantes | Texas | |
| Logotipo |  |
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uA2240C
PROGRAMMABLE TIMER/COUNTER
SLFS045 – JUNE 1978 – REVISED MAY 1988
D Accurate Timing From Microseconds to
Days
N PACKAGE
(TOP VIEW)
D Programmable Delays From 1 Time
Constant to 255 Time Constants
D Outputs Compatible With TTL and CMOS
D Wide Supply-Voltage Range
D External Sync and Modulation Capability
OUTPUTS
Q0 1
Q1 2
Q2 3
Q3 4
Q4 5
16 VCC
15 REGULATOR
14 TIME BASE
13 R/C
12 MODULATION
OUTPUTS
description
Q5 6
Q6 7
11 TRIGGER
10 RESET
INPUTS
The uA2240C consists of a time-base oscillator,
Q7 8
9 GND
an 8-bit counter, a control flip-flop, and a voltage
regulator. The frequency of the time-base oscillator is set by the time constant of an external resistor and
capacitor at R/C and can be synchronized or modulated by signals applied to the modulation input. The output
of the time-base section is applied directly to the input of the counter section and also appears at (TIME BASE).
TIME BASE may be used to monitor the frequency of the oscillator, to provide an output pulse to other circuitry,
or (with the time-base section disabled) to drive the counter input from an external source. The counter input
is activated on a negative-going transition. The reset input stops the time-base oscillator and sets each binary
output, Q0–Q7, and the time-base output to a TTL high level. After resetting, the trigger input starts the oscillator
and all Q outputs go low. Once triggered, the uA2240C will ignore any signals at the trigger input until it is reset.
The uA2240C timer/counter may be operated in the free-running mode or with output-signal feedback to the
reset input for automatic reset. Two or more binary outputs may be connected together to generate complex
pulse patterns, or each output may be used separately to provide eight output frequencies. Using two circuits
in cascade can provide precise time delays of up to three years.
The uA2240C is characterized for operation from 0°C to 70°C.
AVAILABLE OPTIONS
SYMBOLIZATION
OPERATING
DEVICE
PACKAGE SUFFIX TEMPERATURE RANGE
uA2240C
N
0°C to 70°C
VT max
AT 25°C
2V
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright © 1988, Texas Instruments Incorporated
•POST OFFICE BOX 655303 DALLAS, TEXAS 75265
•POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
1
1 page  
uA2240C
PROGRAMMABLE TIMER/COUNTER
TYPICAL CHARACTERISTICS
NORMALIZED TIME-BASE PERIOD
vs
MODULATION INPUT VOLTAGE
2.5
SLFS045 – JUNE 1978 – REVISED MAY 1988
2
1.5
1
0.5
0
123456
Modulation Voltage – V
Figure 4
APPLICATION INFORMATION
Figure 5 shows voltage waveforms for typical
operation of the uA2240C. If both RESET and
TRIGGER are low during power up, the timer/
counter will be in a reset state with all binary (Q)
outputs high and the oscillator stopped. In this state,
a high level on the trigger input starts the time-base
oscillator. The initial negative-going pulse from the
oscillator sets the Q outputs to low logic levels at the
beginning of the first time-base period. The uA2240C
will ignore any further signals at the TRIGGER until
after a reset signal is applied to RESET. With
TRIGGER low, a high level at the reset input will set
Q outputs high and stop the time-base oscillator. If
the reset signal occurs while TRIGGER is high, the
reset is ignored. If RESET remains high when
TRIGGER goes low, the uA2240C will reset.
TRIGGER
RESET
TBO
Q0
Q1
Q7
Figure 5. Timing Diagram of Output Waveform
•POST OFFICE BOX 655303 DALLAS, TEXAS 75265
•POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443
5
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet UA2240C.PDF ] | |
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