Datasheet > WCMA2016U4B

WCMA2016U4B

更新时间： 2022-09-11 11:37:55

品牌	Logo	应用领域
韦达 - WEIDA		/
页数	文件大小	规格书
12页	239K
描述
128K x 16 Static RAM

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WCMA2016U4B 数据手册

WCMA2016U4B

Switching Characteristics Over the Operating Range^[8]

55ns

70 ns

Parameter

READ CYCLE

Description

Min

Max

Min

Max

Unit

t_RC

Read Cycle Time

t_AA

Address to Data Valid

Data Hold from Address Change

CE LOW to Data Valid

OE LOW to Data Valid

OE LOW to Low Z^[9]

t_OHA

t_ACE

t_DOE

t_LZOE

t_HZOE

t_LZCE

t_HZCE

t_PU

[9, 11]

OE HIGH to High Z

[9]

CE LOW to Low Z

CE HIGH to High Z^{[9, 11]}

CE LOW to Power-Up

t_PD

CE HIGH to Power-Down

BHE / BLE LOW to Data Valid

BHE / BLE LOW to Low Z^[9]

t_DBE

[10]

t_LZBE

t_HZBE

[9, 11]

BHE / BLE HIGH to High Z

[12]

WRITE CYCLE

t_WC

t_SCE

t_AW

Write Cycle Time

CE LOW to Write End

Address Set-Up to Write End

Address Hold from Write End

Address Set-Up to Write Start

WEPulse Width

t_HA

t_SA

t_PWE

t_BW

t_SD

BHE / BLE Pulse Width

Data Set-Up to Write End

Data Hold from Write End

WE LOW to High Z^{[9, 11]}

WE HIGH to Low Z^[9]

t_HD

t_HZWE

t_LZWE

Notes:

8. Test conditions assume signal transition time of 5 ns or less, timing reference levels of V_CC(typ.)/2, input pulse levels of 0 to V_CC(typ.), and output loading of

the specified I_OL/I_OHand 30 pF load capacitance.

9. At any given temperature and voltage condition, t_HZCEis less than t_LZCE, t_HZBEis less than t_LZBE, t_HZOEis less than t_LZOE, and t_HZWEis less than t_LZWEfor

any given device.

10. If both byte enables are toggled together this value is 10ns

11. t_HZOE, t_HZCE, t_HZBE, and t_HZWEtransitions are measured when the outputs enter a high impedance state.

12. The internal write time of the memory is defined by the overlap of WE, CE = V_IL, BHE and/orBLE = V_IL. All signals must be ACTIVE to initiate a write and

any of these signals can terminate a write by going INACTIVE. The data input set-up and hold timing should be referenced to the edge of the signal that

terminates the write..

1 2 3 456 7 8...12

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