參數(shù)資料
型號(hào)： HD74AC
廠商： Hitachi,Ltd.
英文描述： HD74AC Series Common Information
中文描述： HD74AC系列通用信息
文件頁(yè)數(shù)： 19/52頁(yè)
文件大?。?/td> 220K
代理商： HD74AC
Definition of Specifications
18
Definition of Specifications
1. Power Dissipation-Test Philosophy
In an erfort to reduce confusion about measuring C
PD
, a JEDEC standard test procedure (7A Appendix E)
has been adopted, which specifies the test setup for each type of device. This allows a device to be
exercised in a consistent manner for the purpose of specification comparison. All device measurements are
made with V
CC
= 5.0 V at 25
°
C, with 3-state outputs both enabled and disabled.
Gates: Switch one input. Bias the remaining inputs such that the output switches.
Latches: Switch the Enable and D inputs such that the latch toggles.
Flip-Flops: Switch the clock pin while changing D (or bias J and K) such that the output (s) change each
clock cycle. For parts with a common clock, exercise only one flip - flop.
Decoders: Switch one address pin which changes two outputs.
Multiplexers: Switch one address pin with the corresponding data inputs at opposite logic levels so that
the output switches.
Counters: Switch the clock pin with other inputs biased such that the device counts.
Shift Registers: Switch the clock pin with other inputs biased such that the device counts.
Transceivers: Switch one data input. For bidirectional devices enable only one direction.
Parity Generator: Switch one input.
Priority Encoders: Switch the lowest priority input.
Load Capacitance: Each output which is switching should be loaded with the standard 50 pF. The
equivalent load capacitance, based upon the number of outputs switching and their
respective frequency, is then subtracted form the measured gross C
PD
number to
obtain the device’s actual C
PD
value.
If the device is tested at a high enough frequency, the static supply current can be ignored. Thus at 1 MHz,
the following formula can be used to calculate C
PD
:
C
PD
= I
CC
/ (V
CC
) (1
× 10
6
) – Equivalent Load Capacitance
相關(guān)PDF資料
PDF描述
HD74ALVC162244 16-bit Buffer / Driver with 3-state Outputs(帶三態(tài)輸出的16位緩沖器/驅(qū)動(dòng)器)
HD74ALVC162334 16-bit Universal Bus Driver with 3-state Outputs(帶三態(tài)輸出的16位通用總線驅(qū)動(dòng)器)
HD74ALVC16244 16-bit Buffer / Driver with 3-state Outputs(帶三態(tài)輸出的16位緩沖器/驅(qū)動(dòng)器)
HD74ALVC162831 1-bit to 4-bit Address Register / Driver with 3-state Outputs(三態(tài)輸出的1位-4位地址寄存器/驅(qū)動(dòng)器)
HD74ALVC162834A 1-Of-8 Data Selectors/Multiplexers 16-CDIP -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
HD74AC00 制造商:HITACHI 制造商全稱:Hitachi Semiconductor 功能描述:Quad 2-Input NAND Gate
HD74AC00FP 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Quad 2-input NAND Gate
HD74AC00FPEL 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate
HD74AC00P 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate
HD74AC00RPEL 制造商:RENESAS 制造商全稱:Renesas Technology Corp 功能描述:Quad 2-Input NAND Gate
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