
DALLAS SEMICONDUCTOR
DS21Q352/DS21Q552/DS21Q354/DS21Q554 Preliminary Data Sheet
December 29, 1998
6
Lead Description Sorted by Symbol Table 2
Lead
Symbol
I/O
Description
M1
8MCLK1
O
8.192 MHz Clock Based on RCLK1.
H17
8MCLK2
O
8.192 MHz Clock Based on RCLK2.
F4
8MCLK3
O
8.192 MHz Clock Based on RCLK3.
V13
8MCLK4
O
8.192 MHz Clock Based on RCLK4.
U3
A0
I
Address Bus Bit 0 (lsb).
L17
A1
I
Address Bus Bit 1.
V2
A2
I
Address Bus Bit 2.
T4
A3
I
Address Bus Bit 3.
V8
A4
I
Address Bus Bit 4.
H4
A5
I
Address Bus Bit 5.
U8
A6
I
Address Bus Bit 6.
P4
A7/ALE
I
Address Bus Bit 7 (msb) / Address Latch Enable.
P2
BTS
I
Bus Type Select (0 = Intel / 1 = Motorola),
W6
CI1
I
Carry Input for Interleaved Bus Operation for SCT1.
F18
CI2
I
Carry Input for Interleaved Bus Operation for SCT2.
D7
CI3
I
Carry Input for Interleaved Bus Operation for SCT3.
T20
CI4
I
Carry Input for Interleaved Bus Operation for SCT4.
V9
CO1
O
Carry Output for Interleaved Bus Operation for SCT1.
B17
CO2
O
Carry Output for Interleaved Bus Operation for SCT2.
A6
CO3
O
Carry Output for Interleaved Bus Operation for SCT3.
J20
CO4
O
Carry Output for Interleaved Bus Operation for SCT4.
P3
CS1*
I
Chip Select for SCT1.
A14
CS2*
I
Chip Select for SCT2.
B5
CS3*
I
Chip Select for SCT3.
K17
CS4*
I
Chip Select for SCT4.
U11
D0/AD0
I/O
Data Bus Bit 0/ Address/Data Bus Bit 0 (lsb).
J19
D1/AD1
I/O
Data Bus Bit 1/ Address/Data Bus Bit 1.
W15
D2/AD2
I/O
Data Bus Bit 2/Address/Data Bus Bit 2.
U7
D3/AD3
I/O
Data Bus Bit 3/Address/Data Bus Bit 3.
U9
D4/AD4
I/O
Data Bus Bit 4/Address/Data Bus Bit 4.
U5
D5/AD5
I/O
Data Bus Bit 5/Address/Data Bus Bit 5.
V4
D6/AD6
I/O
Data Bus Bit 6/Address/Data Bus Bit 6.
U4
D7/AD7
I/O
Data Bus Bit 7/Address/Data Bus Bit 7 (msb).
J3
DVDD1
–
Digital Positive Supply.
N4
DVDD1
–
Digital Positive Supply.
U2
DVDD1
–
Digital Positive Supply.
V5
DVDD1
–
Digital Positive Supply.
B12
DVDD2
–
Digital Positive Supply.
C12
DVDD2
–
Digital Positive Supply.
C16
DVDD2
–
Digital Positive Supply.
D18
DVDD2
–
Digital Positive Supply.
A9
DVDD3
–
Digital Positive Supply.
B3
DVDD3
–
Digital Positive Supply.
B6
DVDD3
–
Digital Positive Supply.
C4
DVDD3
–
Digital Positive Supply.
G20
DVDD4
–
Digital Positive Supply.
M17
DVDD4
–
Digital Positive Supply.
M20
DVDD4
–
Digital Positive Supply.
P18
DVDD4
–
Digital Positive Supply.
H3
DVSS1
–
Digital Signal Ground.
J4
DVSS1
–
Digital Signal Ground.
U6
DVSS1
–
Digital Signal Ground.
W8
DVSS1
–
Digital Signal Ground.