DALLAS SEMICONDUCTOR DS21Q352/DS21Q552/DS21Q354/DS21Q554 Preliminary Data Sheet
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.
December 29, 1998
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