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 HEF4541B MSI Programmable timer Product specification File under Integrated Circuits, IC04 January 1995 Philips Semiconductors Product specification HEF4541B MSI Programmable timer 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, 213 or 216 depending 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 2n frequency divider. 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 Rt and Ct within 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 Fig.1 Functional diagram. 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 FAMILY DATA, IDD LIMITS category MSI Fig.2 Pinning diagram. January 1995 See Family Specifications 2 Philips Semiconductors Product specification HEF4541B MSI Programmable timer Fig.3 Logic diagram. January 1995 3 Philips Semiconductors Product specification HEF4541B MSI Programmable timer PINNING FUNCTION TABLE A0, A1 address inputs MODE mode select input AR auto reset input MR master reset input PH phase input RTC external resistor connection (Rt) CTC external capacitor connection (Ct) RS external resistor connection (RS) or external clock input 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 FREQUENCY SELECTION TABLE X A1 NUMBER OF COUNTER STAGES n L L 13 8 192 L H 10 1 024 H L 8 256 H H 16 65 536 H X output initially HIGH, after reset f osc n --------- = 2 f out A0 L Notes 1. For correct power-on reset, the supply voltage should be above 8.5 V. For VDD < 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 2n-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 RC oscillator Timing component limitations The oscillator frequency is mainly determined by RtCt, provided Rt << RS and RSC2 << RtCt. The function of RS is 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, Ct must be larger than the inherent stray capacitance. Rt must 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 VDD = 15 V. Typical formula for oscillator frequency: 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 ≤ 1 MΩ. 1 f osc = --------------------------------2, 3 × R t × C t Fig.4 External component connection for RC oscillator; RS ≈ 2 Rt. January 1995 4 Philips Semiconductors Product specification HEF4541B MSI Programmable timer Ct curve at Rt = 56 kΩ; RS = 120 kΩ. − − − Rt curve at Ct = 1 nF; RS = 2 Rt. Fig.5 RC oscillator frequency as a function of Rt and Ct at VDD = 5 to 15 V; Tamb = 25 °C. January 1995 5 Philips Semiconductors Product specification HEF4541B MSI Programmable timer Rt = 56 kΩ; Ct = 1 nF; RS = 0. − − − Rt = 56 kΩ; Ct = 1 nF; RS = 120 kΩ. Fig.6 Frequency deviation (∆f) as a function of ambient temperature; referenced at : fosc at Tamb = 25 °C and VDD = 10 V. January 1995 6 Philips Semiconductors Product specification HEF4541B MSI Programmable timer DC CHARACTERISTICS VSS = 0 V Tamb (°C) VDD V VOL V VOH SYMBOL V −40 + 25 MIN. MAX. MIN. Supply current − 5 power-on reset 10 enabled (note) 15 ID + 85 TYP. MAX. MIN. MAX. 80 − 20 80 − 230 µA − 750 − 250 600 − 700 µA − 1600 − 500 1300 − 1500 µA Supply voltage for automatic − − 8,5 5 − − − V 4,6 0,5 − 0,4 − − 0,3 − mA 9,5 −IOH 1,4 − 1,2 − − 0,95 − mA reset initialization (note) VDD Output current HIGH; CTC, RTC 5 10 15 13,5 2,5 −IOH 5 Output current LOW; CTC, RTC 5 0,4 10 0,5 15 1,5 IOL 4,8 − 4,0 − − 3,2 − mA 1,4 − 1,2 − − 0,95 − mA 0,33 − 0,27 − − 0,20 − mA 1,00 − 0,85 − − 0,68 − mA 3,20 − 2,70 − − 2,30 − mA Note 1. All inputs at 0 V or VDD; except input AR = input MR = 0 V (power-on reset active). AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; input transition times ≤ 20 ns VDD V TYPICAL FORMULA FOR P (µW)(1) 5 1 300 fi + foCLVDD2 per package 10 5 300 fi + foCLVDD2 (P) 15 12 000 fi + foCLVDD2 Dynamic power dissipation 5 1 300 fosc + foCLVDD2 when using the 10 on-chip oscillator (P) 15 Total power dissipation + 2CtVDD2 fosc + 10 VDD 5 300 fosc + foCLVDD 2 + + 100 VDD 12 000 fosc + foCLVDD2 + Notes 1. where: fi = input frequency (MHz) fo = output frequency (MHz) CL = load capacitance (pF) VDD = supply voltage (V) Ct = timing capacitance (pF) fosc = oscillator frequency (MHz) January 1995 7 2CtVDD2 fosc 2CtVDD2 fosc + 400 VDD Philips Semiconductors Product specification HEF4541B MSI Programmable timer AC CHARACTERISTICS VSS = 0 V; Tamb = 25 °C; CL = 50 pF; input transition times ≤ 20 ns VDD V SYMBOL MIN. TYP. TYPICAL EXTRAPOLATION FORMULA MAX. Propagation delays RS → O 28 selected HIGH to LOW LOW to HIGH 5 10 15 tPHL; tPLH 375 750 ns 348 ns + (0,55 ns/pF) CL 150 300 ns 139 ns + (0,23 ns/pF) CL 110 220 ns 102 ns + (0,16 ns/pF) CL 425 850 ns 398 ns + (0,55 ns/pF) CL 165 330 ns 154 ns + (0,23 ns/pF) CL 120 240 ns 112 ns + (0,16 ns/pF) CL 510 1020 ns 483 ns + (0,55 ns/pF) CL 190 380 ns 179 ns + (0,23 ns/pF) CL 135 270 ns 127 ns + (0,16 ns/pF) CL 575 1150 ns 548 ns + (0,55 ns/pF) CL 210 420 ns 199 ns + (0,23 ns/pF) CL 150 300 ns 142 ns + (0,16 ns/pF) CL RS → O 210 selected HIGH to LOW LOW to HIGH 5 10 15 tPHL; tPLH RS → O 213 selected HIGH to LOW LOW to HIGH 5 10 15 tPHL; tPLH RS → O 216 selected HIGH to LOW LOW to HIGH Minimum clock pulse width; LOW 5 10 15 tPHL; tPLH 5 10 tWRSL 15 Minimum reset pulse width; HIGH 5 10 tWMRH 15 Maximum clock pulse frequency 5 10 fmax 15 Oscillator frequency 60 30 ns 30 15 ns 24 12 ns 60 30 ns 30 15 ns 24 12 ns 8 16 MHz 15 30 MHz 18 36 MHz 5 10 fosc 15 Oscillator frequency 5 10 fosc 15 January 1995 8 90 kHz Rt = 5 kΩ 90 kHz Ct = 1 nF 90 kHz RS = 10 kΩ 8 kHz Rt = 56 kΩ 8 kHz Ct = 1 nF 8 kHz RS = 120 kΩ