參數(shù)資料
型號: 74HCT688D,652
廠商: NXP Semiconductors
文件頁數(shù): 2/7頁
文件大?。?/td> 0K
描述: IC COMPARATOR MAGNITUDE 20SOIC
產(chǎn)品培訓模塊: Logic Packages
標準包裝: 1,520
系列: 74HCT
類型: 身份比較器
位數(shù): 8
輸出: 低有效
輸出功能: A=B
電源電壓: 4.5 V ~ 5.5 V
輸出電流高,低: 4mA,4mA
額定電壓和最大 CL 時的最大傳播延遲: 34ns @ 4.5V,50pF
電流 - 靜態(tài): 8µA
工作溫度: -40°C ~ 125°C
封裝/外殼: 20-SOIC(0.295",7.50mm 寬)
安裝類型: 表面貼裝
包裝: 管件
December 1990
2
Philips Semiconductors
Product specication
8-bit magnitude comparator
74HC/HCT688
FEATURES
Compare two 8-bit words
Output capability: standard
ICC category: MSI
GENERAL DESCRIPTION
The 74HC/HCT688 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT688 are 8-bit magnitude comparators.
They perform comparison of two 8-bit binary or BCD
words.
The output provides P = Q.
QUICK REFERENCE DATA
GND = 0 V; Tamb =25 °C; tr =tf = 6 ns
Notes
1. CPD is used to determine the dynamic power dissipation (PD in W):
PD =CPD × VCC2 × fi + ∑ (CL × VCC2 × fo)
where:
fi = input frequency in MHz
fo = output frequency in MHz
∑ (CL × VCC2 × fo) = sum of outputs
CL = output load capacitance in pF
VCC = supply voltage in V
2. For HC the condition is VI = GND to VCC
For HCT the condition is VI = GND to VCC 1.5 V
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
tPHL/ tPLH
propagation delay
CL = 15 pF; VCC =5 V
Pn, Qn to P = Q
1717ns
E to P = Q
8
12
ns
CI
input capacitance
3.5
pF
CPD
power dissipation capacitance per package
notes 1 and 2
30
pF
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