参数资料
型号: IDT72V8980J8
厂商: IDT, Integrated Device Technology Inc
文件页数: 5/11页
文件大小: 0K
描述: IC DGTL SW 256X256 44-PLCC
标准包装: 450
系列: 72V
类型: 多路复用器
电路: 1 x 8:8
独立电路: 1
电压电源: 单电源
电源电压: 3 V ~ 3.6 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 44-LCC(J 形引线)
供应商设备封装: 44-PLCC(16.59x16.59)
包装: 带卷 (TR)
其它名称: 72V8980J8
3
Commercial Temperature Range
IDT72V8980 3.3V Time Slot Interchange
Digital Switch 256 x 256
PIN DESCRIPTIONS
SYMBOL
NAME
I/O
DESCRIPTION
GND
Ground.
Ground Rail.
VCC
+3.3 Volt Power Supply.
DTA
Data Acknowledgment
O
This active LOW output indicates that a data bus transfer is complete. A pull-up resistor is required at this
(Open Drain)
output.
RX0-7
RX Input 0 to 7
I
Serial data input streams. These streams have 32 channels at data rates of 2.048 Mb/s.
F0i
Frame Pulse
I
This input identifies frame synchronization signals formatted to ST-BUS specifications.
C4i
Clock
I
4.096 MHz serial clock for shifting data in and out of the data streams.
A0-A5
Address 0 to 5
I
These lines provide the address to IDT72V8980 internal registers.
DS
Data Strobe
I
This is the input for the active HIGH data strobe on the microprocessor interface. This input operates with
CS to enable the internal read and write generation.
R/
W
Read/Write
I
This input controls the direction of the data bus lines (D0-D7) during a microprocessor access.
CS
Chip Select
I
Active LOW input enabling a microprocessor read or write of control register or internal memories.
D0-D7
Data Bus 0 to 7
I/O
These pins provide microprocessor access to data in the internal control register. Connection Memory HIGH,
Connection Memory LOW and data memory.
TX0-7
TX Outputs 0 to 7
O
Serial data output streams. These streams are composed of 32, 64 Kbit/s channels at data rates of 2.048 Mb/s.
ODE
Output Drive Enable
I
This is an output enable for the TX0-7 serial outputs. If this input is LOW, TX0-7 are high-impedance. If this is
HIGH, each channel may still be put into high-impedance by software control.
CCO
Control Channel Output
O
This output is a 2.048 Mb/s line which contains 256 bits per frame. The level of each bit is controlled by the
contents of the CCO bit in the Connection Memory HIGH locations.
RESET
Device Reset
I
This input (active LOW) puts the IDT72V8980 in its reset state that clears the device internal counters,
(Schmitt Trigger Input)
registers and brings TX0-7 and microport data outputs to a high-impedance state. The time constant for a
power up reset circuit must be a minimum of five times the rise time of the power supply. In normal operation,
the
RESET pin must be held LOW for a minimum of 100ns to reset the device.
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