Functional Description
The CY7C1470V25/CY7C1472V25/CY7C1474V25 are 2.5 V,
2 M × 36/4 M × 18/1 M × 72 synchronous pipelined burst SRAMs
with No Bus Latency™ (NoBL logic, respectively. They are
designed to support unlimited true back-to-back read/write
operations with no wait states. The
CY7C1470V25/CY7C1472V25/CY7C1474V25 are equipped
with the advanced (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
in systems that require frequent write/read transitions. The
CY7C1470V25/CY7C1472V25/CY7C1474V25 are pin-compatible
and functionally equivalent to ZBT devices.
All synchronous inputs pass through input registers controlled by
the rising edge of the clock. All data outputs pass through output
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. Write operations are controlled by the Byte Write Selects
(BWa–BWh for CY7C1474V25, BWa–BWd for CY7C1470V25
and BWa–BWb for CY7C1472V25) and a write enable (WE)
input. All writes are conducted with on-chip synchronous
self-timed write circuitry.
Three synchronous chip enables (CE1, CE2, CE3) 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.

Features
■ Pin-compatible and functionally equivalent to ZBT™
■ Supports 200-MHz bus operations with zero wait states
❐ Available speed grades are 200 and 167 MHz
■ Internally self-timed output buffer control to eliminate the need
to use asynchronous OE
■ Fully registered (inputs and outputs) for pipelined operation
■ Byte write capability
■ Single 2.5 V power supply
■ 2.5 V I/O supply (VDDQ)
■ Fast clock-to-output times
❐ 3.0 ns (for 200-MHz device)
■ Clock enable (CEN) pin to suspend operation
■ Synchronous self-timed writes
■ CY7C1470V25 available in JEDEC-standard Pb-free 100-pin
TQFP, Pb-free and non Pb-free 165-ball FBGA package.
CY7C1472V25 available in JEDEC-standard Pb-free 100-pin
TQFP. CY7C1474V25 available in Pb-free and non Pb-free
209-ball FBGA package
■ IEEE 1149.1 JTAG boundary scan compatible
■ Burst capability – linear or interleaved burst order
■ “ZZ” sleep mode option and stop clock option