IDT72V8981 Integrated Device Technology, IDT72V8981 Datasheet
IDT72V8981
Available stocks
Related parts for IDT72V8981
IDT72V8981 Summary of contents
Page 1
... I/O with 5V Tolerant Inputs DESCRIPTION: The IDT72V8981 is a ST-BUS ® compatible digital switch controlled by a microprocessor. The IDT72V8981 can handle as many as 128, 64 Kbit/s input and output channels. Those 128 channels are divided into 4 serial inputs and FUNCTIONAL BLOCK DIAGRAM RX0 Receive RX1 ...
Page 2
... IDT72V8981 3.3V Time Slot Interchange Digital Switch 128 x 128 PIN CONFIGURATION NOTE: 1. DNC - Do Not Connect INDEX RX3 F0i 13 C4i PLCC: 0.05in. pitch, 0.65in. x 0.65in. (J44-1, order code: J) TOP VIEW ...
Page 3
... This input identifies frame synchronization signals formatted to ST-BUS 4.096 MHz serial clock for shifting data in and out of the data streams. These lines provide the address to IDT72V8981 internal registers. 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 ...
Page 4
... Processor mode; i.e., the contents of the Connection Memory LOW (CML, see Table 5) are output on the TX output streams once every frame unless the ODE input pin is LOW bit is HIGH, then the IDT72V8981 behaves as if bits 2 (Channel Source) and 0 (Output Enable) of every Connection Memory High (CMH) locations were set to HIGH, regardless of the actual value ...
Page 5
... IDT72V8981 3.3V Time Slot Interchange Digital Switch 128 x 128 INITIALIZATION OF THE IDT72V8981 On initialization or power up, the contents of the Connection Memory High can be in any state. This is a potentially hazardous condition when multiple TX outputs are tied together to form matrices. The ODE pin should be held low on power up to keep all outputs in the high impedance condition until the contents of the CMH are programmed ...
Page 6
... IDT72V8981 3.3V Time Slot Interchange Digital Switch 128 x 128 TABLE 3 — CONTROL REGISTER CONFIGURATION Bit Name 7 SM (Split Memory) When 1, all subsequent reads are from the Data Memory and writes are to the Connection Memory LOW, except when the Control Register is accessed again. When 0, the Memory Select bits specify the memory for the operations ...
Page 7
... IDT72V8981 3.3V Time Slot Interchange Digital Switch 128 x 128 ABSOLUTE MAXIMUM RATINGS Symbol Parameter Vcc Symbol Voltage Vi Voltage on Digital Inputs GND - 0.3 V Voltage on Digital Outputs GND - 0 Current at Digital Outputs O T Storage Temperature S P Package Power Dissapation D NOTE: 1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause permanent damage to the device ...
Page 8
... IDT72V8981 3.3V Time Slot Interchange Digital Switch 128 x 128 AC ELECTRICAL CHARACTERISTICS Symbol Characteristics (3) t Clock Period CLK t Clock Width High CH t Clock Width Low CL t Clock Transition Time CTT t Frame Pulse Setup Time FPS t Frame Pulse Hold Time FPH t Frame Pulse Width ...
Page 9
... IDT72V8981 3.3V Time Slot Interchange Digital Switch 128 x 128 AC ELECTRICAL CHARACTERISTICS Symbol Characteristics t TX0-3 Delay - Active to High Z TAZ t TX0-3 Delay - High Z to Active TZA t TX0-3 Delay - Active to Active TAA t TX0-3 Hold Time TOH t Output Driver Enable Delay OED t Serial Input Setup Time ...
Page 10
... IDT72V8981 3.3V Time Slot Interchange Digital Switch 128 x 128 AC ELECTRICAL CHARACTERISTICS Symbol Characteristics t Chip Select Setup Time CSS t Read/Write Setup Time RWS t Address Setup Time ADS t Acknowledgment Delay Fast AKD t Acknowledgment Delay Slow AKD t Fast Write Data Setup Time FWS t Slow Write Data Delay ...
Page 11
ORDERING INFORMATION IDT XXXXXX XX Device Type Package DATASHEET DOCUMENT HISTORY 05/23/2000 pgs and 11. 08/18/2000 pgs and 11. 01/24/2001 pgs. 1 and 7. 03/10/2003 pg. 1. 05/09/2003 pgs. 1- and 11. 08/20/2003 pg. ...