DS21455 Maxim Integrated Products, DS21455 Datasheet - Page 25

• Manufacturer Part Number: DS21455
• Description: Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
• Manufacturer: Maxim Integrated Products

Specifications of DS21455

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: BGA

Signal Name:
Signal Description:
Signal Type:
Set low to select nonmultiplexed bus operation. Set high to select multiplexed bus operation.
Signal Name:
Signal Description:
Signal Type:
In nonmultiplexed bus operation (MUX = 0), it serves as the data bus. In multiplexed bus operation (MUX = 1), it serves as an
8-bit, multiplexed address/data bus.
Signal Name:
Signal Description:
Signal Type:
In nonmultiplexed bus operation (MUX = 0), it serves as the address bus. In multiplexed bus operation (MUX = 1), these pins
are not used and should be tied low.
Signal Name:
Signal Description:
Signal Type:
Upper address pins for nonmultiplexed (MUX = 0), and multiplexed (MUX = 1) bus operation.
Signal Name:
Signal Description:
Signal Type:
Strap high to select Motorola bus timing; strap low to select Intel bus timing. This pin controls the function of the RD (DS),
ALE (AS), and WR (R/W) pins. If BTS = 1, then these pins assume the function listed in parentheses ().
Signal Name:
Signal Description:
Signal Type:
RD and DS are active-low signals. DS active HIGH when MUX = 0. See the bus timing diagrams.
Signal Name:
Signal Description:
Signal Type:
Must be low to read or write to Transceiver 1 of the device. CS1 is an active-low signal.
Signal Name:
Signal Description:
Signal Type:
Must be low to read or write to Transceiver 2 of the device. CS2 is an active-low signal.
Signal Name:
Signal Description:
Signal Type:
Must be low to read or write to Transceiver 3 of the device. CS3 is an active-low signal.
Signal Name:
Signal Description:
Signal Type:
Must be low to read or write to Transceiver 4 of the device. CS4 is an active-low signal.
MUX
Bus Operation
Input
AD0 to AD7
Data Bus [D0 to D7] or Address/Data Bus
Input/Output
A0 to A6
Address Bus
Input
A8 and A9 (DS21458 Only)
Address Bus
Input
BTS
Bus Type Select
Input
RD (DS)
Read Input-Data Strobe
Input
CS1 (DS21455 Only)
Chip Select for Transceiver 1
Input
CS2 (DS21455 Only)
Chip Select for Transceiver 2
Input
CS3 (DS21455 Only)
Chip Select for Transceiver 3
Input
CS4 (DS21455 Only)
Chip Select for Transceiver 4
Input
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