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74HC7540D-74HC7540DB-74HCT7540D
74HC/HCT7540; Octal Schmitt trigger buffer/line driver; 3-state; inverting
Philips Semiconductors Product specification
Octal Schmitt trigger buffer/line driver;
3-state; inverting 74HC/HCT7540
FEATURES Inverting outputs Schmitt trigger action on all data inputs Output capability: bus driver ICC category: MSI
GENERAL DESCRIPTIONThe 74HC/HCT7540 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/HCT7540 are octal Schmitt trigger inverting
buffer/line drivers with 3-state outputs. The 3-state outputs
are controlled by the output enable inputs OE1 and OE2.
A HIGH on OEn causes the outputs to assume a high
impedance OFF-state.
The Schmitt trigger action in the data inputs transforms
slowly changing input signals into sharply defined
jitter-free output signals.
The “7540” is identical to the “540” but has hysteresis on
the data inputs.
QUICK REFERENCE DATAGND= 0 V; Tamb =25 °C; tr =tf= 6 ns
Notes CPD is used to determine the dynamic power dissipation (PD in μW): =CPD× VCC2×fi +∑ (CL× VCC2× fo) where:= input frequency in MHz= output frequency in MHz (CL× VCC2×fo)= sum of outputs= output load capacitance in pF
VCC= supply voltage in V For HC the condition is VI= GND to VCC
For HCT the condition is VI= GND to VCC− 1.5 V
ORDERING INFORMATIONSee “74HC/HCT/HCU/HCMOS Logic Package Information”.
Philips Semiconductors Product specification
Octal Schmitt trigger buffer/line driver;
3-state; inverting 74HC/HCT7540
PIN DESCRIPTION
Philips Semiconductors Product specification
Octal Schmitt trigger buffer/line driver;
3-state; inverting 74HC/HCT7540
FUNCTION TABLE
Notes H= HIGH voltage level= LOW voltage level= don’t care= high impedance OFF-state
Philips Semiconductors Product specification
Octal Schmitt trigger buffer/line driver;
3-state; inverting 74HC/HCT7540
DC CHARACTERISTICS FOR 74HCFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Transfer characteristics are given below (not applicable for OEn inputs).
Output capability: bus driver
ICC category: MSI
AC CHARACTERISTICS FOR 74HCGND= 0 V; tr =tf= 6 ns; CL= 50 pF
TRANSFER CHARACTERISTICS FOR 74HCVoltages are referred to GND (ground= 0 V)
Philips Semiconductors Product specification
Octal Schmitt trigger buffer/line driver;
3-state; inverting 74HC/HCT7540
DC CHARACTERISTICS FOR 74HCTFor the DC characteristics see “74HC/HCT/HCU/HCMOS Logic Family Specifications”.
Transfer characteristics are given below (not applicable for OEn inputs).
Output capability: bus driver
ICC category: MSI
Note to HCT typesThe value of additional quiescent supply current (ΔICC) for a unit load of 1 is given in the family specifications.
To determine ΔICC per input, multiply this value by the unit load coefficient shown in the table below.
AC CHARACTERISTICS FOR 74HCTGND= 0 V; tr =tf= 6 ns; CL= 50 pF
TRANSFER CHARACTERISTICS FOR 74HCTVoltages are referred to GND (ground= 0 V)
