CY7C027 Datasheet, PDF (1/19 Pages) Cypress Semiconductor – 32K/64K x 16/18 Dual-Port Static RAM

25/0251
CY7C027/028
CY7C037/038
Features
• True Dual-Ported memory cells which allow simulta-
neous access of the same memory location
• 32K x 16 organization (CY7C027)
• 64K x 16 organization (CY7C028)
• 32K x 18 organization (CY7C037)
• 64K x 18 organization (CY7C038)
• 0.35-micron CMOS for optimum speed/power
• High-speed access: 12^[1]/15/20 ns
• Low operating power
— Active: I_CC = 180 mA (typical)
— Standby: I_SB3 = 0.05 mA (typical)
Logic Block Diagram
R/W_L
UB_L
32K/64K x 16/18
Dual-Port Static RAM
• Fully asynchronous operation
• Automatic power-down
• Expandable data bus to 32/36 bits or more using Mas-
ter/Slave chip select when using more than one device
• On-chip arbitration logic
• Semaphores included to permit software handshaking
between ports
• INT flags for port-to-port communication
• Separate upper-byte and lower-byte control
• Dual Chip Enables
• Pin select for Master or Slave
• Commercial and industrial temperature ranges
• Available in 100-pin TQFP
• Pin-compatible and functionally equivalent to IDT7027
R/W_R
UB_R
CE_0L
CE_1L
LB_L
OE_L
CE_L
[2]
8/9
I/O_8/9L–I/O_15/17L
[3]
8/9
I/O_0L–I/O_7/8L
I/O
Control
I/O
Control
CE_R
CE_0R
CE_1R
LB_R
OE_R
8/9
[2]
I/O_8/9L–I/O_15/17R
8/9
[3]
I/O_0L–I/O_7/8R
[4]
A_0L–A_14/15L
15/16
Address
Decode
True Dual-Ported
RAM Array
Address
Decode
15/16
[4]
A_0R–A_14/15R
[4]
A_0L–A_14/15L
15/16
15/16
[4]
A_0R–A_14/15R
CE_L
Interrupt
CE_R
OE_L
Semaphore
OE_R
R/W_L
SEM_L
BUSY_L^[5]
INT_L
UB_L
LB_L
Arbitration
M/S
R/W_R
SEM_R
[5]
BUSY_R
INT_R
UB_R
LB_R
Notes:
1. See page 6 for Load Conditions.
2. I/O₈–I/O₁₅ for x16 devices; I/O₉–I/O₁₇ for x18 devices.
3. I/O₀–I/O₇ for x16 devices; I/O₀–I/O₈ for x18 devices.
4. A₀–A₁₄ for 32K; A₀–A₁₅ for 64K devices.
5. BUSY is an output in master mode and an input in slave mode.
For the most recent information, visit the Cypress web site at www.cypress.com
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-06042 Rev. *A
Revised December 27, 2002