Cypress CY7C1231H - Manual
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Table of Contents:
- Page 2 – Selection Guide; Unit; Pin Configuration
- Page 3 – Pin Definitions
- Page 4 – Functional Overview; Single Read Accesses; Sleep Mode
- Page 6 – Electrical Characteristics
- Page 7 – Capacitance; Input Capacitance; pF; Clock Input Capacitance; Thermal Resistance; AC Test Loads and Waveforms
- Page 8 – Switching Characteristics
- Page 9 – Switching Waveforms
- Page 11 – Ordering Information; Commercial; Package Diagram
- Page 12 – Document History Page; Issue Date
2-Mbit (128K x 18) Flow-Through SRAM
with NoBL™ Architecture
CY7C1231H
Cypress Semiconductor Corporation
•
198 Champion Court
•
San Jose
,
CA 95134-1709
•
408-943-2600
Document #: 001-00207 Rev. *B
Revised April 26, 2006
Features
• Can support up to 133-MHz bus operations with zero
wait states
— Data is transferred on every clock
• Pin compatible and functionally equivalent to ZBT™
devices
• Internally self-timed output buffer control to eliminate
the need to use OE
• Registered inputs for flow-through operation
• Byte Write capability
• 128K x 18 common I/O architecture
• 3.3V core power supply
• 3.3V/2.5V I/O operation
• Fast clock-to-output times
— 6.5 ns (133-MHz device)
• Clock Enable (CEN) pin to suspend operation
• Synchronous self-timed write
• Asynchronous Output Enable
• Offered in JEDEC-standard lead-free 100-pin TQFP
package
• Burst Capability—linear or interleaved burst order
• Low standby power
Functional Description
[1]
The CY7C1231H is a 3.3V/2.5V, 128K x 18 Synchronous
Flow-through Burst SRAM designed specifically to support
unlimited true back-to-back Read/Write operations without the
insertion of wait states. The CY7C1231H is equipped with the
advanced No Bus Latency™ (NoBL™) logic required to
enable consecutive Read/Write operations with data being
transferred on every clock cycle. This feature dramatically
improves the throughput of data through the SRAM, especially
in systems that require frequent Write-Read transitions.
All synchronous inputs pass through input registers controlled
by the rising edge of the clock. The clock input is qualified by
the Clock Enable (CEN) signal, which when deasserted
suspends operation and extends the previous clock cycle.
Maximum access delay from the clock rise is 6.5 ns (133-MHz
device).
Write operations are controlled by the two Byte Write Select
(BW
[A:B]
) and a Write Enable (WE) input. All writes are
conducted with on-chip synchronous self-timed write circuitry.
Three synchronous Chip Enables (CE
1
, CE
2
, CE
3
) and an
asynchronous Output Enable (OE) provide for easy bank
selection and output tri-state control. In order to avoid bus
contention, the output drivers are synchronously tri-stated
during the data portion of a write sequence.
Note:
1. For best-practices recommendations, please refer to the Cypress application note
System Design Guidelines
on www.cypress.com.
C
MODE
BW
A
BW
B
WE
CE
1
CE
2
CE
3
OE
READ LOGIC
DQs
DQP
A
DQP
B
MEMORY
ARRAY
E
INPUT
REGISTER
ADDRESS
REGISTER
WRITE REGISTRY
AND DATA COHERENCY
CONTROL LOGIC
BURST
LOGIC
A0'
A1'
D1
D0
Q1
Q0
A0
A1
ADV/LD
CE
ADV/LD
C
CLK
CEN
WRITE
DRIVERS
D
A
T
A
S
T
E
E
R
I
N
G
S
E
N
S
E
A
M
P
S
WRITE ADDRESS
REGISTER
A0, A1, A
O
U
T
P
U
T
B
U
F
F
E
R
S
E
ZZ
SLEEP
CONTROL
Logic Block Diagram
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Summary
CY7C1231H Document #: 001-00207 Rev. *B Page 2 of 12 Selection Guide 133 MHz Unit Maximum Access Time 6.5 ns Maximum Operating Current 225 mA Maximum CMOS Standby Current 40 mA Pin Configuration 100-pin TQFP Pinout A A A A A1 A0 NC/ 28 8M NC/144M V SS V DD NC(36M) A A A A A NC /4 M A NC NC V DDQ V S...
CY7C1231H Document #: 001-00207 Rev. *B Page 3 of 12 Pin Definitions Name I/O Description A 0 , A 1 , A Input- Synchronous Address Inputs used to select one of the 128K address locations . Sampled at the rising edge of the CLK. A [1:0] are fed to the two-bit burst counter. BW [A:B] Input- Synchronou...
CY7C1231H Document #: 001-00207 Rev. *B Page 4 of 12 Functional Overview The CY7C1231H is a synchronous flow-through burst SRAMdesigned specifically to eliminate wait states duringWrite-Read transitions. All synchronous inputs pass throughinput registers controlled by the rising edge of the clock. T...
