CY7C1338B Datasheet, PDF (1/18 Pages) Cypress Semiconductor – 128K x 32 Synchronous-Flow-Through 3.3V Cache RAM

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CY7C1338B
128K x 32 Synchronous-Flow-Through 3.3V Cache RAM
Features
Functional Description
• Supports 117-MHz microprocessor cache systems with
zero wait states
• 128K by 32 common I/O
• Fast clock-to-output times
— 7.5 ns (117-MHz version)
• Two-bit wraparound counter supporting either inter-
leaved or linear burst sequence
• Separate processor and controller address strobes
provide direct interface with the processor and external
cache controller
• Synchronous self-timed write
• Asynchronous output enable
• 3.3V/ 2.5V I/Os
• JEDEC-standard pinout
• 100-pin TQFP packaging
• ZZ “sleep” mode
• Available in Commercial and Industrial Temperatures
The CY7C1338B is a 3.3V, 128K by 32 synchronous cache
RAM designed to interface with high-speed microprocessors
with minimum glue logic. Maximum access delay from clock
rise is 7.5 ns (117-MHz version). A 2-bit on-chip counter cap-
tures the first address in a burst and increments the address
automatically for the rest of the burst access.
The CY7C1338B allows both interleaved and linear burst se-
quences, selected by the MODE input pin. A HIGH selects an
interleaved burst sequence, while a LOW selects a linear burst
sequence. Burst accesses can be initiated with the Processor
Address Strobe (ADSP) or the cache Controller Address
Strobe (ADSC) inputs. Address advancement is controlled by
the Address Advancement (ADV) input.
A synchronous self-timed write mechanism is provided to sim-
plify the write interface. A synchronous chip enable input and
an asynchronous output enable input provide easy control for
bank selection and output three-state control.
Logic Block Diagram
CLK
ADV
ADSC
ADSP
A_[16:0]
17
GW
BWE
BW ₃
BW ₂
BW ₁
BW ₀
CE1
CE2
CE 3
MODE
(A₀,A₁) 2
BURST ^Q0
CE COUNTER
CLR
Q1
Q
ADDRESS
15
CE
D
REGISTER
15
D DQ[31:24] Q
BYTEWRITE
REGISTERS
D DQ[23:16] Q
BYTEWRITE
REGISTERS
D DQ[15:8] Q
BYTEWRITE
REGISTERS
D _DQ[7:0] Q
BYTEWRITE
REGISTERS
D
CE
ENABLE
REGISTER
Q
CLK
17
128K X 32
MEMORY
ARRAY
32
32
OE
ZZ
SLEEP
CONTROL
INPUT
REGISTERS
CLK
DQ_[31:0]
Selection Guide
Maximum Access Time (ns)
Maximum Operating Current (mA)
Maximum Standby Current (mA)
Pentium is a registered trademark of Intel Corporation.
-117
-100
7.5
8.0
350
325
2.0
2.0
Cypress Semiconductor Corporation • 3901 North First Street • San Jose • CA 95134 • 408-943-2600
Document #: 38-05143 Rev. **
Revised September 6, 2001