Datasheet HEF4541BU, HEF4541BT, HEF4541BPB, HEF4541BP, HEF4541BDB Datasheet (Philips)

DATA SH EET

Product specification
File under Integrated Circuits, IC04

January 1995

INTEGRATED CIRCUITS

HEF4541B
MSI

Programmable timer

For a complete data sheet, please also download:

•The IC04 LOCMOS HE4000B Logic
Family Specifications HEF, HEC

•The IC04 LOCMOS HE4000B Logic
Package Outlines/Information HEF, HEC

January 1995 2

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

DESCRIPTION

The HEF4541B is a programmable timer which consists of
a 16-stage binary counter, an integrated oscillator to be
used with external timing components, an automatic
power-on reset and output control logic. The frequency of
the oscillator is determined by the external components
Rtand Ctwithin the frequency range 1 Hz to 100 kHz. This
oscillator may be replaced by an external clock signal at
input RS, the timer advances on the positive-going
transition of RS. A LOW on the auto reset input (AR) and
a LOW on the master reset input (MR) enables the internal
power-on reset. A HIGH level at input MR resets the
counter independent on all other inputs. Resetting

disables the oscillator to provide no active power
dissipation.
A HIGH at input

AR turns off the power-on reset to provide
a low quiescent power dissipation of the timer. The
16-stage counter divides the oscillator frequency by
28,210,213or 216depending on the state of the address
inputs (A0,A1). The divided oscillator frequency is
available at output O. The phase input (PH) features a
complementary output signal. If the mode select input
(MODE) is LOW or HIGH the timer can be used
respectively as a single transition timer or 2nfrequency
divider.

Fig.1 Functional diagram.

Fig.2 Pinning diagram.

FAMILY DATA, IDDLIMITS category MSI

See Family Specifications

HEF4541BP(N): 14-lead DIL; plastic

(SOT27-1)

HEF4541BD(F): 14-lead DIL; ceramic (cerdip)

(SOT73)

HEF4541BT(D): 14-lead SO; plastic

(SOT108-1)

( ): Package Designator North America

January 1995 3

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

Fig.3 Logic diagram.

January 1995 4

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

PINNING

FREQUENCY SELECTION TABLE

A

0,A1

address inputs
MODE mode select input
AR auto reset input
MR master reset input
PH phase input
R

TC

external resistor connection (Rt)
C

TC

external capacitor connection (Ct)
RS external resistor connection (R

S

)or

external clock input

A

0

A

1

NUMBER OF

COUNTER STAGES n

L L 13 8 192

L H 10 1 024
H L 8 256
H H 16 65 536

f

osc

f

out

--------- 2n=

FUNCTION TABLE

Notes

1. For correct power-on reset, the supply voltage should
be above 8.5 V. For V

DD

< 8.5 V, disable the autoreset

and connect AR to VDD.

2. The timer is initialized on a reset pulse and the output
changes state after 2

n-1

counts and remains in that
state (latched). Reset of this latch is obtained by
master reset or by a LOW to HIGH transition on the
MODE input.

H = HIGH state (the more positive voltage)
L = LOW state (the less positive voltage)
X = state is immaterial

INPUTS

MODE

AR MR PH MODE

H L X X auto reset disabled

L L X X auto reset enabled

(1)

X H X X master reset active
X L X H normal operation selected

division to output

X L X L single-cycle mode

(2)

X L L X output initially LOW,

after reset

X L H X output initially HIGH,

after reset

RC oscillator

Fig.4 External component connection for RC

oscillator; RS≈ 2 Rt.

Typical formula for oscillator
frequency:

f

osc

1

23 RtCt××,

---------------------------------=

Timing component limitations

The oscillator frequency is mainly determined by
RtCt, provided Rt << RSand RSC2 << RtCt. The function of
RSis to minimize the influence of the forward voltage
across the input protection diodes on the frequency. The
stray capacitance C2 should be kept as small as possible.
In consideration of accuracy, Ctmust be larger than the
inherent stray capacitance. Rtmust be larger than the
LOCMOS ‘ON’ resistance in series with it, which typically
is 500 Ω at VDD= 5 V, 300 Ω at VDD= 10 V and 200 Ω at
V

DD

= 15 V.

The recommended values for these components to
maintain agreement with the typical oscillation formula are:

Ct≥ 100 pF, up to any typical value,
10 kΩ≤Rt≤1MΩ.

January 1995 5

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

Fig.5 RC oscillator frequency as a function of Rtand Ctat VDD= 5 to 15 V; T

amb

=25°C.

 Ctcurve at Rt= 56 kΩ;RS= 120 kΩ.

−−− R

t

curve at Ct= 1 nF; RS=2 Rt.

January 1995 6

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

Fig.6 Frequency deviation (∆f) as a function of ambient temperature; referenced at : f

osc

at T

amb

=25°C and

VDD= 10 V.

 Rt= 56 kΩ;Ct= 1 nF; RS=0.

−−−R

t

= 56 kΩ; Ct= 1 nF; RS= 120 kΩ.

January 1995 7

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

DC CHARACTERISTICS

V

SS

=0 V

Note

1. All inputs at 0 V or V

DD

; except input AR = input MR = 0 V (power-on reset active).

AC CHARACTERISTICS

V

SS

= 0 V; T

amb

=25°C; input transition times ≤ 20 ns

Notes

1. where:
f

i

= input frequency (MHz)
fo= output frequency (MHz)
CL= load capacitance (pF)
VDD= supply voltage (V)
Ct= timing capacitance (pF)
f

osc

= oscillator frequency (MHz)

V

DD

V

V

OL

V

V

OH

V

SYMBOL

T

amb

(°C)

−40 + 25 + 85

MIN. MAX. MIN. TYP. MAX. MIN. MAX.

Supply current 5 − 80 − 20 80 − 230 µA

power-on reset 10 I

D

− 750 − 250 600 − 700 µA

enabled (note) 15 − 1600 − 500 1300 − 1500 µA

Supply voltage for automatic

reset initialization (note) V

DD

−−8,5 5 −− −V

Output current 5 4,6 0,5 − 0,4 −− 0,3 − mA

HIGH; CTC,R

TC

10 9,5 −I

OH

1,4 − 1,2 −− 0,95 − mA

15 13,5 4,8 − 4,0 −− 3,2 − mA

5 2,5 −I

OH

1,4 − 1,2 −− 0,95 − mA

Output current 5 0,4 0,33 − 0,27 −− 0,20 − mA

LOW; C

TC,RTC

10 0,5 I

OL

1,00 − 0,85 −− 0,68 − mA

15 1,5 3,20 − 2,70 −− 2,30 − mA

V

DD

V

TYPICAL FORMULA FOR P (µW)

(1)

Dynamic power dissipation 5 1 300 fi+ foCLV

DD

2

per package 10 5 300 fi+ foCLV

DD

2

(P) 15 12 000 fi+ foCLV

DD

2

Total power dissipation 5 1 300 f

osc

+ foCLV

DD

2

+ 2CtV

DD

2

f

osc

+ 10 V

DD

when using the 10 5 300 f

osc

+ foCLV

DD

2

+ 2CtV

DD

2

f

osc

+ 100 V

DD

on-chip oscillator (P) 15 12 000 f

osc

+ foCLV

DD

2

+ 2CtV

DD

2

f

osc

+ 400 V

DD

January 1995 8

Philips Semiconductors Product specification

Programmable timer

HEF4541B

MSI

AC CHARACTERISTICS

V

SS

= 0 V; T

amb

=25°C; CL= 50 pF; input transition times ≤ 20 ns

V

DD

V

SYMBOL MIN. TYP. MAX.

TYPICAL EXTRAPOLATION

FORMULA

Propagation delays

RS → O
2

8

selected 5

t

PHL

;

t

PLH

375 750 ns 348 ns + (0,55 ns/pF) C

L

HIGH to LOW
LOW to HIGH

10 150 300 ns 139 ns + (0,23 ns/pF) C

L

15 110 220 ns 102 ns + (0,16 ns/pF) C

L

RS → O
2

10

selected 5

t

PHL

;

t

PLH

425 850 ns 398 ns + (0,55 ns/pF) C

L

HIGH to LOW
LOW to HIGH

10 165 330 ns 154 ns + (0,23 ns/pF) C

L

15 120 240 ns 112 ns + (0,16 ns/pF) C

L

RS → O
2

13

selected 5

t

PHL

;

t

PLH

510 1020 ns 483 ns + (0,55 ns/pF) C

L

HIGH to LOW
LOW to HIGH

10 190 380 ns 179 ns + (0,23 ns/pF) C

L

15 135 270 ns 127 ns + (0,16 ns/pF) C

L

RS → O
2

16

selected 5

t

PHL

;

t

PLH

575 1150 ns 548 ns + (0,55 ns/pF) C

L

HIGH to LOW
LOW to HIGH

10 210 420 ns 199 ns + (0,23 ns/pF) C

L

15 150 300 ns 142 ns + (0,16 ns/pF) C

L

Minimum clock 5 60 30 ns

pulse width; LOW 10 t

WRSL

30 15 ns

15 24 12 ns

Minimum reset 5 60 30 ns

pulse width; HIGH 10 t

WMRH

30 15 ns

15 24 12 ns

Maximum clock 5 8 16 MHz

pulse frequency 10 f

max

15 30 MHz

15 18 36 MHz

Oscillator frequency 5 90 kHz R

t

=5 kΩ

10 f

osc

90 kHz Ct= 1 nF

15 90 kHz R

S

= 10 kΩ

Oscillator frequency 5 8 kHz R

t

= 56 kΩ

10 f

osc

8 kHz Ct= 1 nF

15 8 kHz R

S

= 120 kΩ