74HC5555D-T Datasheet, PDF (2/23 Pages) NXP Semiconductors – Programmable delay timer with oscillator

Philips Semiconductors
Programmable delay timer with oscillator
Product specification
74HC/HCT5555
FEATURES
• Positive and negative edge
triggered
• Retriggerable or non-retriggerable
• Programmable delay
minimum: 100 ns
maximum: depends on input
frequency and division ratio
• Divide-by range of 2 to 2²⁴
• Direct reset terminates output
pulse
• Very low power consumption in
triggered start mode
• 3 oscillator operating modes:
– RC oscillator
– Crystal oscillator
– External oscillator
• Device is unaffected by variations
in temperature and V_CC when using
an external oscillator
• Automatic power-ON reset
• Schmitt trigger action on both
trigger inputs
• Direct drive for a power transistor
• Low power consumption in active
mode with respect to TTL type
timers
• High precision due to digital timing
• Output capability: 20 mA
• I_CC category: MSI.
APPLICATIONS
• Motor control
• Attic fan timers
• Delay circuits
• Automotive applications
• Precision timing
• Domestic appliances.
GENERAL DESCRIPTION
The 74HC/HCT5555 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/HCT5555 are precision
programmable delay timers which
consist of:
• 24-stage binary counter
• integrated oscillator (using external
timing components)
• retriggerable/non-retriggerable
monostable
• automatic power-ON reset
• output control logic
• oscillator control logic
• overriding asynchronous master
reset (MR).
QUICK REFERENCE DATA
GND = 0 V; T_amb = 25 °C; t_r = t_f = 6 ns.
SYMBOL
PARAMETER
CONDITIONS
t_PHL/t_PLH
C_I
C_PD
propagation delay
A, B to Q/Q
MR to Q/Q
RS to Q/Q
input capacitance
power dissipation
capacitance per buffer
C_L = 15 pF;
V_CC = 5 V
notes 1 and 2
TYP. UNIT
24 24 ns
19 20 ns
26 28 ns
3.5 3.5 pF
23 36 pF
Notes
1. C_PD is used to determine the dynamic power dissipation (P_D in µW):
P_D = C_PD x V_CC2 x f_i + Σ(C_L x V_CC2 x f_o) where:
f_i = input frequency in MHz
f_o = output frequency in MHz
Σ(C_L x V_CC2 x f_o) = sum of outputs.
C_L = output load capacitance in pF
V_CC = supply voltage in V
2. For HC the condition is V_I = GND to V_CC
For HCT the condition is V_I = GND to V_CC − 1.5 V.
ORDERING INFORMATION
EXTENDED TYPE
NUMBER
74HC/HCT5555N
74HC/HCT5555D
PINS
16
16
PACKAGE
PIN POSITION MATERIAL
DIL
SO16
plastic
plastic
CODE
SOT38Z
SOT109A
September 1993
2