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INTEGRATED CIRCUITS
DATA SHEET
For a complete data sheet, please also download:
* The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications * The IC06 74HC/HCT/HCU/HCMOS Logic Package Information * The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines
74HC/HCT191 Presettable synchronous 4-bit binary up/down counter
Product specification File under Integrated Circuits, IC06 December 1990
Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
FEATURES * Synchronous reversible counting * Asynchronous parallel load * Count enable control for synchronous expansion * Single up/down control input * Output capability: standard * ICC category: MSI GENERAL DESCRIPTION The 74HC/HCT191 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/HCT191 are asynchronously presettable 4-bit binary up/down counters. They contain four master/slave flip-flops with internal gating and steering logic to provide asynchronous preset and synchronous count-up and count-down operation. Asynchronous parallel load capability permits the counter to be preset to any desired number. Information present on the parallel data inputs (D0 to D3) is loaded into the counter and appears on the outputs when the parallel load (PL) input is LOW. As indicated in the function table, this operation overrides the counting function. Counting is inhibited by a HIGH level on the count enable (CE) input. When CE is LOW internal state changes are initiated synchronously by the LOW-to-HIGH transition of the clock input. The up/down (U/D) input signal determines the direction of counting as indicated in the function table. The CE input may go LOW when the clock is in either state, however, the LOW-to-HIGH CE transition must occur only when the clock is HIGH. Also, the U/D input should be changed only when either CE or CP is HIGH.
74HC/HCT191
Overflow/underflow indications are provided by two types of outputs, the terminal count (TC) and ripple clock (RC). The TC output is normally LOW and goes HIGH when a circuit reaches zero in the count-down mode or reaches "15" in the count-up-mode. The TC output will remain HIGH until a state change occurs, either by counting or presetting, or until U/D is changed. Do not use the TC output as a clock signal because it is subject to decoding spikes. The TC signal is used internally to enable the RC output. When TC is HIGH and CE is LOW, the RC output follows the clock pulse (CP). This feature simplifies the design of multistage counters as shown in Figs 5 and 6. In Fig.5, each RC output is used as the clock input to the next higher stage. It is only necessary to inhibit the first stage to prevent counting in all stages, since a HIGH on CE inhibits the RC output pulse as indicated in the function table. The timing skew between state changes in the first and last stages is represented by the cumulative delay of the clock as it ripples through the preceding stages. This can be a disadvantage of this configuration in some applications. Fig.6 shows a method of causing state changes to occur simultaneously in all stages. The RC outputs propagate the carry/borrow signals in ripple fashion and all clock inputs are driven in parallel. In this configuration the duration of the clock LOW state must be long enough to allow the negative-going edge of the carry/borrow signal to ripple through to the last stage before the clock goes HIGH. Since the RC output of any package goes HIGH shortly after its CP input goes HIGH there is no such restriction on the HIGH-state duration of the clock. In Fig.7, the configuration shown avoids ripple delays and their associated restrictions. Combining the TC signals from all the preceding stages forms the CE input for a given stage. An enable must be included in each carry gate in order to inhibit counting. The TC output of a given stage it not affected by its own CE signal therefore the simple inhibit scheme of Figs 5 and 6 does not apply.
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
QUICK REFERENCE DATA GND = 0 V; Tamb = 25 C; tr = tf = 6 ns
74HC/HCT191
TYPICAL SYMBOL tPHL/ tPLH fmax CI CPD Notes 1. CPD is used to determine the dynamic power dissipation (PD in W): PD = CPD x VCC2 x fi + (CL x VCC2 x fo) where: fi = input frequency in MHz fo = output frequency in MHz (CL x VCC2 x fo) = sum of outputs CL = output load capacitance in pF VCC = supply voltage in V 2. For HC the condition is VI = GND to VCC For HCT the condition is VI = GND to VCC -1.5 V ORDERING INFORMATION See "74HC/HCT/HCU/HCMOS Logic Package Information". PARAMETER propagation delay CP to Qn maximum clock frequency input capacitance power dissipation capacitance per package notes 1 and 2 CONDITIONS HC CL = 15 pF; VCC = 5 V 22 36 3.5 31 HCT 22 36 3.5 33 ns MHz pF pF UNIT
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
PIN DESCRIPTION PIN NO. 3, 2, 6, 7 4 5 8 11 12 13 14 15, 1, 10, 9 16 SYMBOL Q0 to Q3 CE U/D GND PL TC RC CP D0 to D3 VCC NAME AND FUNCTION flip-flop outputs count enable input (active LOW) up/down input ground (0 V) parallel load input (active LOW) terminal count output ripple clock output (active LOW)
74HC/HCT191
clock input (LOW-to-HIGH, edge triggered) data inputs positive supply voltage
Fig.1 Pin configuration.
Fig.2 Logic symbol.
Fig.3 IEC logic symbol.
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
74HC/HCT191
Fig.4 Functional diagram.
FUNCTION TABLE INPUTS OPERATING MODE PL parallel load count up count down hold (do nothing) TC AND RC FUNCTION TABLE INPUTS U/D H L L L H H Notes 1. H = HIGH voltage level L = LOW voltage level I = LOW voltage level one set-up time prior to the LOW-to-HIGH CP transition X = don't care = LOW-to-HIGH CP transition = one LOW level pulse = TC goes LOW on a LOW-to-HIGH CP transition CE H H L H H L CP X X X X Q0 H H H L L L TERMINAL COUNT STATE Q1 H H H L L L Q2 H H H L L L Q3 H H H L L L OUTPUTS TC L H L H RC H H H H L L H H H U/D X X L H X CE X X I I H CP X X X Dn L H X X X Qn L H count up count down no change OUTPUTS
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
74HC/HCT191
Fig.5 N-stage ripple counter using ripple clock.
Fig.6 Synchronous n-stage counter using ripple carry/borrow.
Fig.7 Synchronous n-stage counter with parallel gated carry/borrow.
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
74HC/HCT191
Sequence Load (preset) to binary thirteen; count up to fourteen, fifteen, zero, one and two; inhibit; count down to one, zero, fifteen, fourteen and thirteen.
Fig.8
Typical load, count and inhibit sequence.
Fig.9 Logic diagram.
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
DC CHARACTERISTICS FOR 74HC For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI AC CHARACTERISTICS FOR 74HC GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HC SYMBOL PARAMETER +25 min. typ. max. tPHL/ tPLH propagation delay CP to Qn propagation delay CP to TC propagation delay CP to RC propagation delay CE to RC propagation delay Dn to Qn propagation delay PL to Qn propagation delay U/D to TC propagation delay U/D to RC output transition time 72 26 21 83 30 24 47 17 14 33 12 10 61 22 18 61 22 18 44 16 13 50 18 14 19 7 6 125 25 21 100 20 17 28 10 8 22 8 6 220 44 37 255 51 43 150 30 26 130 26 22 220 44 37 220 44 37 190 38 32 210 42 36 75 15 13 155 31 26 125 25 21 -40 to +85 min. -40 to +125 max. 330 66 56 395 77 65 225 45 38 195 39 33 330 66 56 330 66 56 285 57 48 315 63 54 110 22 19 195 39 33 150 30 26 ns
74HC/HCT191
TEST CONDITIONS UNIT V CC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 WAVEFORMS
max. min. 275 55 47 320 64 54 190 38 33 165 33 28 275 55 47 275 55 47 240 48 41 265 53 45 95 19 16
Fig.10
tPHL/ tPLH
ns
Fig.10
tPHL/ tPLH
ns
Fig.11
tPHL/ tPLH
ns
Fig.11
tPHL/ tPLH
ns
Fig.12
tPHL/ tPLH
ns
Fig.13
tPHL/ tPLH
ns
Fig.14
tPHL/ tPLH
ns
Fig.14
tTHL/ tTLH
ns
Fig.15
tW
clock pulse width HIGH or LOW parallel load pulse width LOW
ns
Fig.10
tW
ns
Fig.15
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
Tamb (C) 74HC SYMBOL PARAMETER +25 min. typ. max. trem removal time PL to CP set-up time U/D to CP set-up time Dn to PL set-up time CE to CP hold time U/D to CP hold time Dn to PL hold time CE to CP maximum clock pulse frequency 35 7 6 205 41 35 100 20 17 140 28 24 0 0 0 0 0 0 0 0 0 4.0 20 24 8 3 2 50 18 14 19 7 6 44 16 13 -39 -14 -11 -11 -4 -3 -28 -10 -8 11 33 39 -40 to +85 min. 45 9 8 255 51 43 125 25 21 175 35 30 0 0 0 0 0 0 0 0 0 3.2 16 19 -40 to +125 max. ns
74HC/HCT191
TEST CONDITIONS UNIT V CC (V) 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 2.0 4.5 6.0 WAVEFORMS
max. min. 55 11 9 310 62 53 150 30 26 210 42 36 0 0 0 0 0 0 0 0 0 2.6 13 15
Fig.15
tsu
ns
Fig.17
tsu
ns
Fig.16
tsu
ns
Fig.17
th
ns
Fig.17
th
ns
Fig.16
th
ns
Fig.17
fmax
MHz
Fig.10
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
DC CHARACTERISTICS FOR 74HCT For the DC characteristics see "74HC/HCT/HCU/HCMOS Logic Family Specifications". Output capability: standard ICC category: MSI Note to HCT types
74HC/HCT191
The value of additional quiescent supply current (ICC) for a unit load of 1 is given in the family specifications. To determine ICC per input, multiply this value by the unit load coefficient shown in the table below.
INPUT Dn CP U/D CE, PL
UNIT LOAD COEFFICIENT 0.5 0.65 1.15 1.5
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
AC CHARACTERISTICS FOR 74HCT GND = 0 V; tr = tf = 6 ns; CL = 50 pF Tamb (C) 74HC SYMBOL PARAMETER +25 min. typ. max. tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tPHL/ tPLH tTHL/ tTLH tW tW trem tsu tsu tsu th th th fmax propagation delay CP to Qn propagation delay CP to TC propagation delay CP to RC propagation delay CE to RC propagation delay Dn to Qn propagation delay PL to Qn propagation delay U/D to TC propagation delay U/D to RC output transition time clock pulse width HIGH or LOW parallel load pulse width LOW removal time PL to CP set-up time U/D to CP set-up time Dn to PL set-up time CE to CP hold time U/D to CP hold time Dn to PL hold time CE to CP maximum clock pulse frequency 16 22 7 41 20 30 0 0 0 20 26 32 19 19 22 27 23 24 7 9 11 1 20 9 18 -18 -5 -10 33 48 51 35 33 44 46 45 45 15 20 28 9 51 25 38 0 0 0 16 -40 to +85 min. -40 to +125 max. 72 77 53 50 66 69 68 68 22 24 33 11 62 30 45 0 0 0 13 ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns MHz
74HC/HCT191
TEST CONDITIONS UNIT V CC (V) 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 4.5 WAVEFORMS
max. min. 60 64 44 41 55 58 56 56 19
Fig.10 Fig.10 Fig.11 Fig.11 Fig.12 Fig.13 Fig.14 Fig.14 Fig.15 Fig.10 Fig.15 Fig.15 Fig.17 Fig.16 Fig.17 Fig.17 Fig.16 Fig.17 Fig.10
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
AC WAVEFORMS
74HC/HCT191
(1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.10 Waveforms showing the clock (CP) to output (Qn) propagation delays, the clock pulse width and the maximum clock pulse frequency.
(1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.11 Waveforms showing the clock and count enable inputs (CP, CE) to ripple clock output (RC) propagation delays.
(1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.12 Waveforms showing the input (Dn) to output (Qn) propagation delays.
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
74HC/HCT191
(1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.13 Waveforms showing the input (PL) to output (Qn) propagation delays.
(1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.14 Waveforms showing the up/down count input (U/D) to terminal count and ripple clock output (TC, RC) propagation delays.
(1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.15 Waveforms showing the parallel load input (PL) pulse width, removal time to clock (CP) and the output (Qn) transition times.
December 1990
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Philips Semiconductors
Product specification
Presettable synchronous 4-bit binary up/down counter
74HC/HCT191
The shaded areas indicate when the input is permitted to change for predictable output performance. (1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.16 Waveforms showing the set-up and hold times from the parallel load input (PL) to the data input (Dn).
The shaded areas indicate when the input is permitted to change for predictable output performance. (1) HC : VM = 50%; VI = GND to VCC. HCT : VM = 1.3 V; VI = GND to 3 V.
Fig.17 Waveforms showing the set-up and hold times from the count enable and up/down inputs (CE, U/D) to the clock (CP).
PACKAGE OUTLINES See "74HC/HCT/HCU/HCMOS Logic Package Outlines".
December 1990
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