CY7C199C-20ZI Cypress Semiconductor Corp, CY7C199C-20ZI Datasheet - Page 8

• Manufacturer Part Number: CY7C199C-20ZI
• Description: IC SRAM 256KBIT 20NS 28TSOP
• Manufacturer: Cypress Semiconductor Corp

Specifications of CY7C199C-20ZI

• Format - Memory: RAM
• Memory Type: SRAM - Asynchronous
• Memory Size: 256K (32K x 8)
• Speed: 20ns
• Interface: Parallel
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-TSOP I
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 428-1574

Document #: 38-05408 Rev. *A
Read Cycle No. 2
Write Cycle No. 1
Notes:
Data In/Out
Data Out
Current
12. This cycle is OE Controlled and WE is HIGH read cycle.
13. Address valid prior to or coincident with CE transition LOW.
14. This cycle is WE controlled, OE is HIGH during write.
15. Data In/Out is high impedance if OE = V
16. During this period the I/Os are in output state and input signals
should not be applied.
Address
Address
V
WE
OE
CE
OE
CE
CC
Undefined
see footnotes
12 13
(WE Controlled) 14 15 16
I
I
CC
SB
High Z
t
HZOE
t
SA
IH
.
t
LZCE
t
PU
t
AW
t
ACE
t
t
SCE
LZOE
50%
t
DOE
Data-In Valid
t
WC
t
RC
t
t
SD
PWE
Data Valid
t
HD
t
HZOE
t
HA
CY7C199C
50%
t
HZCE
t
PD
Page 8 of 12
High Z