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INTEGRATED CIRCUITS
DATA SHEET
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
HEF4522B MSI Programmable 4-bit BCD down counter
Product specification File under Integrated Circuits, IC04 January 1995
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
DESCRIPTION The HEF4522B is a synchronous programmable 4-bit BCD down counter with an active HIGH and an active LOW clock input (CP0, CP1), an asynchronous parallel load input (PL), four parallel inputs (P0 to P3), a cascade feedback input (CF), four buffered parallel outputs (O0 to O3), a terminal count output (TC) and an overriding asynchronous master reset input (MR). This device is a programmable, cascadable down counter with a decoded TC output for divide-by-n applications. In single stage applications the TC output is connected to PL. CF allows cascade divide-by-n operation with no additional gates required.
HEF4522B MSI
Information on P0 to P3 is loaded into the counter while PL is HIGH, independent of all other input conditions except MR, which must be LOW. When PL and CP1 are LOW, the counter advances on a LOW to HIGH transition of CP0. When PL is LOW and CP0 is HIGH, the counter advances on a HIGH to LOW transition of CP1. TC is HIGH when the counter is in the zero state (O0 = O1 = O2 = O3 = LOW) and CF is HIGH and PL is LOW. A HIGH on MR resets the counter (O0 to O3 = LOW) independent of other input conditions. Schmitt-trigger action in the clock input makes the circuit highly tolerant to slower clock rise and fall times.
Fig.1 Functional diagram.
FAMILY DATA, IDD LIMITS category MSI See Family Specifications
January 1995
2
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
HEF4522B MSI
HEF4522BP(N): HEF4522BD(F): HEF4522BT(D):
16-lead DIL; plastic (SOT38-1) 16-lead DIL; ceramic (cerdip) (SOT74) 16-lead SO; plastic (SOT109-1)
( ): Package Designator North America
Fig.2 Pinning diagram.
PINNING PL P0 to P3 CF CP0 CP1 MR TC O0 to O3 parallel load input parallel inputs cascade feedback input clock input (LOW to HIGH, triggered) clock input (HIGH to LOW, triggered) asynchronous master reset input terminal count output buffered parallel outputs
COUNTING MODE CF = HIGH; PL = LOW; MR = LOW OUTPUTS COUNT O3 9 8 7 6 5 4 3 2 1 0 H H L L L L L L L L O2 L L H H H H L L L L O1 L L H H L L H H L L O0 H L H L H L H L H L
FUNCTION TABLE MR H L L L L L L L Notes 1. H = HIGH state (the more positive voltage) L = LOW state (the less positive voltage) X = state is immaterial = positive-going transition = negative-going transition PL X H L L L L L L H X L L X CP0 X X CP1 X X H MODE reset (asynchronous) preset (asynchronous) no change no change no change no change counter advances counter advances
January 1995
3
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
SINGLE STAGE OPERATION Divide-by-n; MR = LOW; CF = HIGH; CP1 = LOW PL L TC TC TC TC TC TC TC TC TC TC TC TC TC TC TC TC P3 X H H H H H H H H L L L L L L L L P2 X H H H H L L L L H H H H L L L L P1 X H H L L H H L L H H L L H H L L P0 X H L H L H L H L H L H L H L H L DIVIDE BY 10 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 no operation clock pulse HIGH TC OUTPUT PULSE WIDTH one clock period
HEF4522B MSI
Fig.3 State diagram.
January 1995
4
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Programmable 4-bit BCD down counter HEF4522B MSI
Product specification
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
AC CHARACTERISTICS VSS = 0 V; Tamb = 25 C; input transition times 20 ns VDD V Dynamic power dissipation per package (P) 5 10 15 TYPICAL FORMULA FOR P (W) 1000 fi + (foCL) x VDD2 4000 fi + (foCL) x 10 000 fi + (foCL) x VDD2 VDD2 where fi = input freq. (MHz) fo = output freq. (MHz)
HEF4522B MSI
CL = load capacitance (pF) (foCL) = sum of outputs VDD = supply voltage (V) AC CHARACTERISTICS VSS = 0 V; Tamb = 25 C; CL = 50 pF; input transition times 20 ns VDD V Propagation delays CP0, CP1 On HIGH to LOW 5 10 15 5 LOW to HIGH CP0, CP1 TC HIGH to LOW 10 15 5 10 15 5 LOW to HIGH PL On HIGH to LOW 10 15 5 10 15 5 LOW to HIGH MR On HIGH to LOW Output transition times HIGH to LOW 10 15 5 10 15 5 10 15 5 LOW to HIGH 10 15 January 1995 6 tTLH tTHL tPHL tPLH tPHL tPLH tPHL tPLH tPHL 150 65 50 150 65 50 210 90 70 210 90 70 200 80 60 180 70 50 140 55 40 60 30 20 60 30 20 300 130 100 300 130 100 420 180 140 420 180 140 400 160 120 360 140 100 280 110 80 120 60 40 120 60 40 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns 123 ns + (0,55 ns/pF) CL 54 ns + (0,23 ns/pF) CL 42 ns + (0,16 ns/pF) CL 123 ns + (0,55 ns/pF) CL 54 ns + (0,23 ns/pF) CL 42 ns + (0,16 ns/pF) CL 183 ns + (0,55 ns/pF) CL 79 ns + (0,23 ns/pF) CL 62 ns + (0,16 ns/pF) CL 183 ns + (0,55 ns/pF) CL 79 ns + (0,23 ns/pF) CL 62 ns + (0,16 ns/pF) CL 173 ns + (0,55 ns/pF) CL 69 ns + (0,23 ns/pF) CL 52 ns + (0,16 ns/pF) CL 153 ns + (0,55 ns/pF) CL 59 ns + (0,23 ns/pF) CL 42 ns + (0,16 ns/pF) CL 113 ns + (0,55 ns/pF) CL 44 ns + (0,23 ns/pF) CL 32 ns + (0,16 ns/pF) CL 10 ns + (1,0 ns/pF) CL 9 ns + (0,42 ns/pF) CL 6 ns + (0,28 ns/pF) CL 10 ns + (1,0 ns/pF) CL 9 ns + (0,42 ns/pF) CL 6 ns + (0,28 ns/pF) CL SYMBOL MIN. TYP. MAX. TYPICAL EXTRAPOLATION FORMULA
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
AC CHARACTERISTICS VSS = 0 V; Tamb = 25 C; CL = 50 pF; input transition times 20 ns VDD V Minimum clock pulse width; CP0 LOW Minimum clock pulse width; CP1 HIGH Minimum PL pulse width; HIGH Minimum MR pulse width; HIGH Hold time Pn PL Set-up time Pn PL Maximum clock pulse frequency PL = LOW Note 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 5 10 15 fmax tsu thold tWMRH tWPLH tWCPH tWCPL SYMBOL MIN. 80 40 30 80 40 30 100 40 32 130 50 40 30 20 15 30 20 15 6 12 16 TYP. 40 20 15 40 20 15 50 20 16 65 25 20 5 5 5 0 0 0 12 25 32 MAX. ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns MHz MHz MHz
HEF4522B MSI
see also waveforms Figs 5 and 6
see note 1
1. In the divide-by-n mode (PL connected to TC), one has to observe the maximum HIGH to LOW propagation delay for CP to TC, before applying the next clock pulse.
January 1995
7
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
HEF4522B MSI
Fig.5
Waveforms showing minimum PL pulse width, propagation delays for PL, Pn to On and hold time for PL to Pn.
Fig.6
Waveforms showing minimum CP0 and CP1 pulse widths, propagation delays for CP0, CP1 to On and TC.
January 1995
8
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
APPLICATION INFORMATION Some examples of applications for the HEF4522B are: * Divide-by-n counter * Programmable frequency divider
HEF4522B MSI
Counting cycle:
Fig.7
Typical application of two HEF4522B circuits in a 2-stage programmable down counter (one cycle). S are thumbwheel switches; when open: LOW state.
January 1995
9
Philips Semiconductors
Product specification
Programmable 4-bit BCD down counter
HEF4522B MSI
Counting cycle:
Fig.8
Typical application of two HEF4522B circuits in a 2-stage programmable frequency divider. S are thumbwheel switches; when open: LOW state.
January 1995
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