SC9270C/D 查看數據表（PDF） - Silan Microelectronics
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SC9270C/D Datasheet PDF : 12 Pages
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Silan
Semiconductors
SC9270C/D
PIN DESCRIPTION
Pin No. Pin Name I/O
1
IN+
I
2
IN-
I
3
GS
--
4
VREF
O
5
INH
I
6
PWDN
I
7
OSC1
I
8
OSC2
O
9
VSS
--
10
TOE
I
11~14
Q1 ~ Q4
O
15
StD
O
16
ESt
O
17
St/GT
I/O
18
VDD
--
Description
Non-Inverting input
Inverting input
Connections to the front-end differential amplifier.
Gain select. Gives access to output of front-end differential amplifier for
connection of feedback resistor.
Reference voltage output, nominally VDD/2. May be used to bias the inputs at
mid-rail (see application diagram).
Inhibit (input) logic high inhibit the detection of 1633Hz internal built-in pull down
resistor. (SC9270D only). (For SC9270C, this pin must be tied to VSS )
Power down (input). Active high power down the device and inhibit the oscillator
internal built-in pull down resistor. (SC9270D only). (For SC9270C, this pin
must be tied to VSS )
Clock Input
3.579545MHz crystal connected between these pins
Clock Output
completes internal oscillator.
Negative power supply, normally connected to 0V.
3-state data output enable. Logic high enables the outputs Q1-Q4. This pin is
Internally pulled up.
3-state data outputs. When enabled by TOE, provide the code corresponding to
the last valid tone-pair received (see Table 1). When TOE is logic low, the data
outputs are high impedance.
Delayed steering output. Presents a logic high when a received tone-pair has
been registered and the output latch updated; returns to logic low when the
voltage on St/GT falls below VTSt.
Early steering output. Presents a logic high immediately when the digital
algorithm detects a recognizable tone-pair (signal condition). Any momentary
loss of signal condition will cause ESt to return to a logic low.
Steering input/guard time output (bi-directional). A voltage greater than VTSt
detected at St causes the device to register the detected tone-pair and update
the output latch. A voltage less than VTSt frees the device to accept a new tone-
pair. The GT output acts to reset the external steering time-constant; its state is
a function of ESt and the voltage on St.
Positive power supply.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1 2001.04.27
6
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