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MC14536B bảng dữ liệu(PDF) 5 Page - ON Semiconductor |
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MC14536B bảng dữ liệu(HTML) 5 Page - ON Semiconductor |
5 / 14 page MC14536B http://onsemi.com 5 PIN DESCRIPTIONS INPUTS SET (Pin 1) −A high on Set asynchronously forces Decode Out to a high level. This is accomplished by setting an output conditioning latch to a high level while at the same time resetting the 24 flip−flop stages. After Set goes low (inactive), the occurrence of the first negative clock transition on IN1 causes Decode Out to go low. The counter’s flip−flop stages begin counting on the second negative clock transition of IN1. When Set is high, the on−chip RC oscillator is disabled. This allows for very low−power standby operation. RESET (Pin 2) − A high on Reset asynchronously forces Decode Out to a low level; all 24 flip−flop stages are also reset to a low level. Like the Set input, Reset disables the on−chip RC oscillator for standby operation. IN1 (Pin 3) −The device’s internal counters advance on the negative−going edge of this input. IN1 may be used as an external clock input or used in conjunction with OUT1 and OUT2 to form an RC oscillator. When an external clock is used, both OUT1 and OUT2 may be left unconnected or used to drive 1 LSTTL or several CMOS loads. 8−BYPASS (Pin 6) − A high on this input causes the first 8 flip−flop stages to be bypassed. This device essentially becomes a 16−stage counter with all 16 stages selectable. Selection is accomplished by the A, B, C, and D inputs. (See the truth tables.) CLOCK INHIBIT (Pin 7) − A high on this input disconnects the first counter stage from the clocking source. This holds the present count and inhibits further counting. However, the clocking source may continue to run. Therefore, when Clock Inhibit is brought low, no oscillator startup time is required. When Clock Inhibit is low, the counter will start counting on the occurrence of the first negative edge of the clocking source at IN1. OSC INHIBIT (Pin 14) − A high level on this pin stops the RC oscillator which allows for very low−power standby operation. May also be used, in conjunction with an external clock, with essentially the same results as the Clock Inhibit input. MONO−IN (Pin 15) − Used as the timing pin for the on−chip monostable multivibrator. If the Mono−In input is connected to VSS, the monostable circuit is disabled, and Decode Out is directly connected to the selected Q output. The monostable circuit is enabled if a resistor is connected between Mono−In and VDD. This resistor and the device’s internal capacitance will determine the minimum output pulse widths. With the addition of an external capacitor to VSS, the pulse width range may be extended. For reliable operation the resistor value should be limited to the range of 5 k W to 100 kW and the capacitor value should be limited to a maximum of 1000 pf. (See figures 5, 6, 7, and 12). A, B, C, D (Pins 9, 10, 11, 12) − These inputs select the flip−flop stage to be connected to Decode Out. (See the truth tables.) OUTPUTS OUT1, OUT2 (Pin 4, 5) −Outputs used in conjunction with IN1 to form an RC oscillator. These outputs are buffered and may be used for 20 frequency division of an external clock. DECODE OUT (Pin 13) − Output function depends on configuration. When the monostable circuit is disabled, this output is a 50% duty cycle square wave during free run. TEST MODE The test mode configuration divides the 24 flip−flop stages into three 8−stage sections to facilitate a fast test sequence. The test mode is enabled when 8−Bypass, Set and Reset are at a high level. (See Figure 10.) TRUTH TABLES Input Stage Selected for Decode Out 8−Bypass D C B A 0 0 0 0 0 9 0 0 0 0 1 10 0 0 0 1 0 11 0 0 0 1 1 12 0 0 1 0 0 13 0 0 1 0 1 14 0 0 1 1 0 15 0 0 1 1 1 16 0 1 0 0 0 17 0 1 0 0 1 18 0 1 0 1 0 19 0 1 0 1 1 20 0 1 1 0 0 21 0 1 1 0 1 22 0 1 1 1 0 23 0 1 1 1 1 24 Input Stage Selected for Decode Out 8−Bypass D C B A 1 0 0 0 0 1 1 0 0 0 1 2 1 0 0 1 0 3 1 0 0 1 1 4 1 0 1 0 0 5 1 0 1 0 1 6 1 0 1 1 0 7 1 0 1 1 1 8 1 1 0 0 0 9 1 1 0 0 1 10 1 1 0 1 0 11 1 1 0 1 1 12 1 1 1 0 0 13 1 1 1 0 1 14 1 1 1 1 0 15 1 1 1 1 1 16 |
Số phần tương tự - MC14536B |
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Mô tả tương tự - MC14536B |
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