IN91531 데이터 시트보기 (PDF) - Integral Corp.
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IN91531 Datasheet PDF : 7 Pages
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IN91531
PIN DESCRIPTION
PinNo. Designation
DESCRIPTION
1
MODE Tone mode select input.
When this input is high, the tone output and ASK output are normal. When this input is
low, a DTMF signal will be generated continuously and any new input data will be
ignored.
This input affects the tone output mode only.
2
LATCH Latch input.
When input on this pin changes from low to high (at the rising edge), the IN91531 latches
the 4-bit input data and T/P input. The latch input should not be changed back from low to
high again until the ASK output falls low, and new data must not be latched while the
ASK output is still low.
3
M/B Make/Break ratio select input.
This pin is used to select one of two available make/break ratios. A high input selects the
2/3 make/break ratio; a low input selects the 1/23 ratio. This input should be connected to
VCC or GND only. Changing the state of this pin when CE is active (low) enables the test
mode.
4
T/P Tone/pulse mode select input.
This input determines whether tone or pulse mode will be activated. It is latched together
with the 4-bit data input.
5 - 8 D0 - D3 4-bit data input pins.
This 4-bit parallel input is used to receive data generated by the microcomputer. (Input
data vs. output signal is shown in table 1.) Valid input data should be presented at these
inputs before and during the rising edge of the latch signal.
9
DP
Dial pulse output.
The dial pulse output consists of an N-channel open drain device. During dial pulse break
periods this output is switched on (sinking current to GND); it is switched off during all
other states. Dialing rate is 9.71 PPS and post-digit pause is 823 ms. (The output of this
pin during test mode is discussed below.)
10
GND Negative power supply input.
16
VCC
Positive power supply input (operating range 2.5 to 5.5 volts).
11
OSC0 Oscillator output.
12
OSC1 Oscillator input.
The IN91531 contains an oscillator circuit with the necessary parasitic capacitance and
feedback resistor on chip, making it necessary to connect only a standard 3.58 MHz TV
crystal across the OSC1 and OSC0 terminals to implement the oscillator function. An
external clock input can be applied to the OSC1 pin directly. The oscillator is enabled
when the CE input is low.
13
CE
Chip enable input.
This input controls the onset of oscillation and serves as the master reset for this device.
14
ASK Acknowledge output.
This pin provides an acknowledge signal to the microcomputer. This output is high when
the device is ready to dial out the next digit; it falls low immediately after the rising edge
of the latch signal.
15
TONE DTMF signal output.
This pin consists of an NPN transistor output, with the collector connected to VCC. This
pin is also connected to the emitter output. The internally generated DTMF signal is
delivered to the base of the NPN transistor and is amplified as the transistor connected in
common collector. DTMF signaling output time is 70 ms and the interdigit interval is
70 ms. Typical output impedance of the DTMF signal is 1.25 kΩ, and the hFE of the NPN
transistor is at least 30 at IC = 3 mA.
2
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