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tm 74vhc221a dual non-retriggerable monostable multivibrator may 2007 ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 74vhc221a dual non-retriggerable monostable multivibrator features high speed: t pd = 8.1ns (typ.) at v cc = 5v low power dissipation: i cc = 4? (max.) at t a = 25? active state: i cc = 600? (max.) at t a = 25? high noise immunity: v nih = v nil = 28% v cc (min.) power down protection is provided on all inputs pin and function compatible with 74hc221a general description the vhc221a is an advanced high speed cmos monostable multivibrator fabricated with silicon gate cmos technology. it achieves the high speed operation similar to equivalent bipolar schottky ttl while main- taining the cmos low power dissipation. each multi- vibrator features both a negative, a, and a positive, b, transition triggered input, either of which can be used as an inhibit input. also included is a clear input that when taken low resets the one-shot. the vhc221a can be triggered on the positive transition of the clear while a is held low and b is held high. the vhc221a is non- retriggerable, and therefore cannot be retriggered until the output pulse times out. the output pulse width is determined by the equation: pw = (rx)(cx) where, pw is in seconds, r is in ohms, and c is in farads. limits for r x and c x are: external capacitor, c x : no limit external resistors, r x :v cc = 2.0v, 5k ? min. v cc > 3.0v, 1 k ? min an input protection circuit ensures that 0 to 7v can be applied to the input pins without regard to the supply voltage. this device can be used to interface 5v to 3v systems and two supply systems such as battery back up. this circuit prevents device destruction due to mis- matched supply and input voltages. ordering information surface mount packages are also available on tape and reel. specify by appending the suffix letter ??to the ordering code. order number package number package description 74vhc221am m16a 16-lead small outline integrated circuit (soic), jedec ms-012, 0.150" narrow 74vhc221asj m16d 16-lead small outline package (sop), eiaj type ii, 5.3mm wide 74vhc221amtc mtc16 16-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 2 connection diagram logic symbol ieee/iec truth table h = high voltage level l = low voltage level = high-to-low transition = low-to-high transition x = don? care block diagrams note a: cx, rx, dx are external capacitor, resistor, and diode, respectively. note b: external clamping diode, dx; external capacitor is charged to v cc level in the wait state, i.e. when no trigger is applied. if the supply voltage is turned off, cx discharges mainly through the internal (parasitic) diode. if cx is sufficiently large and v cc drops rapidly, there will be some possibil- ity of damaging the ic through in rush current or latch- up. if the capacitance of the supply voltage filter is large enough and v cc drops slowly, the in rush current is automatically limited and damage to the ic is avoided. the maximum value of forward current through the para- sitic diode is ?0 ma. in the case of a large cx, the limit of fall time of the supply voltage is determined as follows: t f (v cc ?0.7) cx / 20ma (t f is the time between the supply voltage turn off and the supply voltage reaching 0.4 v cc ) in the event a system does not satisfy the above condi- tion, an external clamping diode (dx) is needed to protect the ic from rush current. inputs outputs function a b clr qq hh output enable x lhl h inhibit hx hl h inhibit lh output enable lh output enable xx ll h reset
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 3 system diagram timing chart
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 4 functional description 1. stand-by state the external capacitor (cx) is fully charged to v cc in the stand-by state. that means, before triggering, the q p and q n transistors which are connected to the rx/cx node are in the off state. two comparators that relate to the timing of the output pulse, and two refer- ence voltage supplies turn off. the total supply cur- rent is only leakage current. 2. trigger operation trigger operation is effective in any of the following three cases. first, the condition where the a input is low, and b input has a rising signal; second, where the b input is high, and the a input has a falling sig- nal; and third, where the a input is low and the b input is high, and the clr input has a rising signal. after a trigger becomes effective, comparators c1 and c2 start operating, and q n is turned on. the external capacitor discharges through q n . the volt- age level at the rx/cx node drops. if the rx/cx volt- age level falls to the internal reference voltage v ref l, the output of c1 becomes low. the flip-flop is then reset and q n turns off. at that moment c1 stops but c2 continues operating. after q n turns off, the voltage at the rx/cx node starts rising at a rate determined by the time constant of external capacitor cx and resistor rx. upon triggering, output q becomes high, following some delay time of the internal f/f and gates. it stays high even if the voltage of rx/cx changes from fall- ing to rising. when rx/cx reaches the internal refer- ence voltage v ref h, the output of c2 becomes low, the output q goes low and c2 stops its operation. that means, after triggering, when the voltage level of the rx/cx node reaches v ref h, the ic returns to its monostable state. with large values of cx and rx, and ignoring the dis- charge time of the capacitor and internal delays of the ic, the width of the output pulse, t w (out), is as follows: t w (out) = 1.0 cx rx 3. reset operation in normal operation, the clr input is held high. if clr is low, a trigger has no affect because the q output is held low and the trigger control f/f is reset. also, q p turns on and cx is charged rapidly to v cc . this means if clr is set low, the ic goes into a wait state.
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 5 absolute maximum ratings stresses exceeding the absolute maximum ratings may damage the device. the device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. in addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. the absolute maximum ratings are stress ratings only. recommended operating conditions (1) the recommended operating conditions table defines the conditions for actual device operation. recommended operating conditions are specified to ensure optimal performance to the datasheet specifications. fairchild does not recommend exceeding them or designing to absolute maximum ratings. notes: 1. unused inputs must be held high or low. they may not float. 2. the maximum allowable values of cx and rx are a function of the leakage of capacitor cx, the leakage of the device, and leakage due to board layout and surface resistance. susceptibility to externally induced noise signals may occur for rx > 1 m ? . symbol parameter rating v cc supply voltage ?.5v to +7.0v v in dc input voltage ?.5v to +7.0v v out dc output voltage ?.5v to v cc + 0.5v i ik input diode current ?0ma i ok output diode current ?0ma i out dc output current ?5ma i cc dc v cc / gnd current ?0ma t stg storage temperature ?5? to +150? t l lead temperature (soldering, 10 seconds) 260? symbol parameter rating v cc supply voltage 2.0v to +5.5v v in input voltage 0v to +5.5v v out output voltage 0v to v cc t opr operating temperature ?0? to +85? t r , t f input rise and fall time (clr only) v cc = 3.3v ?0.3v v cc = 5.0v ?0.5v 0ns/v 100ns/v 0ns/v 20ns/v external capacitor, cx no limitation (2) f external resistor, rx > 5k ? (2) (v cc = 2.0v) > 1k ? (2) (v cc > 3.0v)
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 6 dc electrical characteristics note: 3. per circuit. symbol parameter v cc (v) conditions t a = 25? t a = ?0?to 85? units min. typ. max. min. max. v ih high level input v oltage 2.0 1.50 1.50 v 3.0?.5 0.7 x v cc 0.7 x v cc v il low level input v oltage 2.0 0.50 0.50 v 3.0?.5 0.3 x v cc 0.3 x v cc v oh high level output voltage 2.0 v in = v ih or v il i oh = ?0? 1.9 2.0 1.9 v 3.0 2.9 3.0 2.9 4.5 4.4 4.5 4.4 3.0 i oh = ?ma 2.58 2.48 4.5 i oh = ?ma 3.94 3.80 v ol low level output voltage 2.0 v in = v ih or v il i ol = 50? 0.0 0.1 0.1 v 3.0 0.0 0.1 0.1 4.5 0.0 0.1 0.1 3.0 i ol = 4ma 0.36 0.44 4.5 i ol = 8ma 0.36 0.44 i in input leakage current 0?.5 v in = 5.5v or gnd ?.1 ?.0 ? i in rx/cx terminal off-state current 5.5 v in = v cc or gnd ?.25 ?.50 ? i cc quiescent supply current 5.5 v in = v cc or gnd 4.0 40.0 ? i cc active?tate (3) supply current 3.0 v in = v cc or gnd, rx/cx = 0.5 v cc 160 250 280 ? 4.5 380 500 650 5.5 560 750 975
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 7 ac electrical characteristics (4) notes: 4. refer to 74vhc221a timing chart. 5. c pd is defined as the value of the internal equivalent capacitance which is calculated from the operating current consumption without load. average operating current can be obtained by the equation: i cc (opr.) = c pd ?v cc ?f in + i cc 1 ?duty / 100 + i cc / 2 (per circuit) i cc 1 : active supply current duty: % ac operating requirement symbol parameter v cc (v) conditions t a = 25? t a = ?0? to +85? units min. typ. max. min. max. t plh , t phl propagation delay time (a, b?, q ) 3.3 ?0.3 c l = 15pf 13.4 20.6 1.0 24.0 ns c l = 50pf 15.9 24.1 1.0 27.5 5.0 ?0.5 c l = 15pf 8.1 12.0 1.0 14.0 ns c l = 50pf 9.6 14.0 1.0 16.0 t plh , t phl propagation delay time (clr trigger?, q ) 3.3 ?0.3 c l = 15pf 14.5 22.4 1.0 26.0 ns c l = 50pf 17.0 25.9 1.0 29.5 5.0 ?0.5 c l = 15pf 8.7 12.9 1.0 15.0 ns c l = 50pf 10.2 14.9 1.0 17.0 t plh , t phl propagation delay time (clr?, q ) 3.3 ?0.3 c l = 15pf 10.3 15.8 1.0 18.5 ns c l = 50pf 12.8 19.3 1.0 22.0 5.0 ?0.5 c l = 15pf 6.3 9.4 1.0 11.0 ns c l = 50pf 7.8 11.4 1.0 13.0 t w out output pulse width 2.0 c x = 28pf, c l = 50pf, r x = 6k ? 415 3.3 ?0.3 345 ns 5.0 ?0.5 312 3.3 ?0.3 c l = 50pf, cx = 28pf, rx = 2k ? 160 240 300 ns 5.0 ?0.5 133 200 240 3.3 ?0.3 c l = 50pf, cx = 0.01?, rx = 10k ? 90 100 110 90 110 ? 5.0 ?0.5 90 100 110 90 110 3.3 ?0.3 c l = 50pf, cx = 0.1?, rx = 10k ? 0.9 1.0 1.1 0.9 1.1 ms 5.0 ?0.5 0.9 1.0 1.1 0.9 1.1 ? t wout output pulse width error between circuits (in same package) ? % c in input capacitance v cc = open 4 10 10 pf c pd po w er dissipation capacitance (5) 73 pf symbol parameter v cc (v) t a = 25? t a = ?0? to +85? units min. typ. max. min. max. t w (l) minimum trigger 3.3 5.0 5.0 ns t w (h) pulse width 5.0 5.0 5.0 t w (l) minimum clear pulse width 3.3 5.0 5.0 ns 5.0 5.0 5.0
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 8 device characteristics t wout *c x characteristics (typ.) output pulse width constant k-supply voltage (typical) input equivalent circuit
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 9 physical dimensions dimensions are in millimeters unless otherwise noted. figure 1. 16-lead small outline integrated circuit (soic), jedec ms-012, 0.150" narrow pa ck ag e number m16a
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 10 physical dimensions (continued) dimensions are in millimeters unless otherwise noted. figure 2. 16-lead small outline package (sop), eiaj type ii, 5.3mm wide pa ck ag e number m16d
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 11 physical dimensions (continued) dimensions are in millimeters unless otherwise noted. figure 3. 16-lead thin shrink small outline package (tssop), jedec mo-153, 4.4mm wide pa ck ag e number mtc16 0.65 4.40.1 mtc16rev4 0.11 4.55 5.00 5.000.10 12 7.35 4.45 1.45 5.90
74vhc221a dual non-retriggerable monostable multivibrator ?994 fairchild semiconductor corporation www.fairchildsemi.com 74vhc221a rev. 1.2 12 trademarks the following are registered and unregistered trademarks fairchild semiconductor owns or is authorized to use and is not intended to be an exhaustive list of all such trademarks. acex across the board. around the world. activearray bottomless build it now coolfet crossvolt ctl current transfer logic dome e 2 cmos ecospark ensigna fact quiet series fact fast fastr fps frfet globaloptoisolator gto hisec i-lo implieddisconnect intellimax isoplanar microcoupler micropak microwire motion-spm msx msxpro ocx ocxpro optologic optoplanar pacman pdp-spm pop power220 power247 poweredge powersaver power-spm powertrench programmable active droop qfet qs qt optoelectronics quiet series rapidconfigure rapidconnect scalarpump smart start spm stealth superfet supersot-3 supersot-6 supersot-8 syncfet tcm the power franchise tinyboost tinybuck tinylogic tinyopto tinypower tinywire trutranslation serdes uhc unifet vcx wire disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others. these specifications do not expand the terms of fairchild? worldwide terms and conditions, specifically the warranty therein, which covers these products. life support policy fairchild? products are not authorized for use as critical components in life support devices or systems without the express written approval of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems wh ich, (a) are intended for surgical implant into the body or (b) support or sustain life, and (c) whose failure to perform w hen properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support, device, or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. product status definitions definition of terms datasheet identification product status definition advance information formative or in design this datasheet contains the design specifications for product development. specifications may change in any manner without notice. preliminary this datasheet contains preliminary data; supplementary data will be published at a later date. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. no identification needed full production first production this datasheet contains final specifications. fairchild semiconductor reserves the right to make changes at any time without notice to improve design. obsolete not in production this datasheet contains specifications on a product that has been discontinued by fairchild semiconductor. the datasheet is printed for reference information only. rev. i26

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