Maxim DS21Q55 specifications Mux, Bts

Product Preview DS21Q55

Signal Name:	MUX
Signal Description:	Bus Operation
Signal Type:	Input

Set low to select nonmultiplexed bus operation. Set high to select multiplexed bus operation.

Signal Name:	D0/AD0 to D7/AD7
Signal Description:	Data Bus [D0 to D7] or Address/Data Bus
Signal Type:	Input/Output

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:	A0 to A6
Signal Description:	Address Bus
Signal Type:	Input

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:	BTS
Signal Description:	Bus Type Select
Signal Type:	Input

Strap high to select Motorola bus timing; strap low to select Intel bus timing. This pin controls the function of the RD*(DS*), A7/ALE(AS), and WR*(R/W*) pins. If BTS = 1, then these pins assume the function listed in parenthesis ().

Signal Name:	RD*(DS*)
Signal Description:	Read Input-Data Strobe
Signal Type:	Input

RD* and DS* are active-low signals. DS active HIGH when MUX = 0. See bus timing diagrams.

Signal Name:	CS1*
Signal Description:	Chip Select for transceiver #1
Signal Type:	Input

Must be low to read or write to transceiver #1 of the device. CS1* is an active-low signal.

Signal Name:	CS2*
Signal Description:	Chip Select for transceiver #2
Signal Type:	Input
Must be low to read or write to transceiver #2 of		the device. CS2* is an active-low signal.
Signal Name:	CS3*
Signal Description:	Chip Select for transceiver #3
Signal Type:	Input
Must be low to read or write to transceiver #3 of		the device. CS3* is an active-low signal.
Signal Name:	CS4*
Signal Description:	Chip Select for transceiver #4
Signal Type:	Input
Must be low to read or write to transceiver #4 of		the device. CS4* is an active-low signal.

19 of 248 012103

Please contact telecom.support@dalsemi.com or search http://www.maxim-ic.com for updated

information.