The DS21455/DS21458 is a quad monolithic device featuring independent transceivers that can be software configured for T1, E1, or J1 operation. Each is composed of a line interface unit (LIU), framer, HDLC controllers, and a TDM backplane interface, and is controlled via an 8-bit parallel port configured for Intel or Motorola bus operations. The DS21455* is a direct replacement for the older DS21Q55 quad MCM device. The DS21458, in a smaller package (17mm CSBGA) and featuring an improved controller interface, is software compatible with the older DS21Q55. Unlike the DS21Q55, which has a JTAG controller-per-transceiver architecture, the JTAG function on the DS21455/DS21458 is a single controller for all four transceivers.
The DS21455 and DS21458 are quad monolithic devices featuring four independent transceivers that can be software configured for T1, E1, or J1 operation. Each device is composed of a line interface unit (LIU), framer, HDLC controllers, and a TDM backplane interface, controlled via an 8-bit parallel port.
| Operating Temperature Range | 0°C to +70°C or -40°C to +85°C |
|---|---|
| Package Type | 256 BGA or 256 CSBGA |
| Supply Voltage | 3.3V with 5V Tolerant Inputs and Outputs |
The devices can be software configured for T1, E1, or J1 operation.
The DS21458 is available in a 17mm x 17mm CSBGA package.
The DS21455 operates from 0°C to +70°C.
The device can connect to asynchronous backplanes up to 16.384MHz.