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.
