CY7C144-55JXC Cypress Semiconductor Corp, CY7C144-55JXC Datasheet - Page 12

• Manufacturer Part Number: CY7C144-55JXC
• Description: IC SRAM 64KBIT 55NS 68PLCC
• Manufacturer: Cypress Semiconductor Corp
• Type: Asynchronousr

Specifications of CY7C144-55JXC

• Memory Size: 64K (8K x 8)
• Package / Case: 68-PLCC
• Format - Memory: RAM
• Memory Type: SRAM - Dual Port, Asynchronous
• Speed: 55ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: 0°C ~ 70°C
• Access Time: 55 ns
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 4.5 V
• Maximum Operating Current: 160 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Number Of Ports: 2
• Operating Supply Voltage: 5 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 428-2155; CY7C144-55JXC

Switching Waveforms
Notes
Document #: 38-06034 Rev. *H
19. The internal write time of the memory is defined by the overlap of CE or SEM LOW and R/W LOW. Both signals must be LOW to initiate a write, and either signal can
20. If OE is LOW during a R/W controlled write cycle, the write pulse width must be the larger of t
21. R/W must be HIGH during all address transitions.
22. Data I/O pins enter high impedance when OE is held LOW during write.
Data Out
terminate a write by going HIGH. The data input set-up and hold timing should be referenced to the rising edge of the signal that terminates the write.
placed on the bus for the required t
be as short as the specified t
SEM OR CE
Address
SEM OR CE
Data Out
Data In
Address
Data In
R/W
OE
R/W
Figure 9. Write Cycle No. 2: R/W Three-State Data I/Os (Either Port)
Figure 8. Write Cycle No. 1: OE Three-State Data I/Os (Either Port)
PWE
t
SA
.
SD
. If OE is HIGH during a R/W controlled write cycle (as in this example), this requirement does not apply and the write pulse can
(continued)
t
SA
t
HZOE
t
SCE
t
SCE
t
AW
t
AW
High Impedance
t
HZWE
t
WC
t
WC
t
PWE
t
PWE
PWE
t
SD
Data Valid
t
SD
or (t
High Impedance
Data Valid
HZWE
+ t
SD
) to allow the I/O drivers to turn off and data to be
t
HD
t
t
HD
LZWE
t
[19, 20, 21]
HA
t
[19, 21, 22]
LZOE
t
HA
CY7C144 CY7C145
Page 12 of 23
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