Am8T26A Am8T28 Schottky Three-State Quad Bus Driver/Receiver Distinctive Characteristics Advanced Schottky technology 48mA driver sink current Three-state outputs on driver and reciever PNP inputs Am8T26A has inverting outputs Am8T28 has non-inverting outputs @ Driver propagation delay 14ns max. for 8T26A 17ns max. for 8T28 @ Receiver propagation delay 14ns max. for 8T26A 17ns max. for 8T28 @ 100% reliability assurance testing in compliance wit MIL-STD-883 FUNCTIONAL DESCRIPTION The Am8T26A/Am8T28 are high speed bus transceivers consisting of four bus drivers with three-state outputs and four bus receivers, also with three-state outputs. Each driver output is internally connected to a receiver input. Both the drivers and receivers have PNP inputs. One buffered common bus enable input is connected to the four drivers and another buffered common receiver enable input is connected to the receivers. A LOW on the bus enable (B/E) input forces the four driver outputs to the high-impedance state. A HIGH on the bus enable allows input data to be transferred onto the data bus. A HIGH on the receiver enable (R/E) input forces the four receiver Outputs to the high-impedance state while a LOW on the receiver enable input allows the received data to be transferred to the output. The complementary design of the bus enable and receiver enable inputs allows these control LOGIC SYMBOL 7 9 12 ; | | | D D D. D. 0 1 2 3 Ay 2 16 4 B/E Ai LE 5 AmB126A Ro R 11 1 OF RE A 14 3h By By 83 I 10 od & 13 Voc = Pin 16 inputs to be connected together externally such that a single GNo - Pin 8 transmit/receive function is derived. LiC-561 LOGIC DIAGRAMS Am8T26A Am8T28 Inverting Output (Three-State) Non-Inverting Output (Three-State) D9 Dy Dy D3 Do Dy Dy D3 {4} (7h (9) (12) (4) Q) (9) {12} B/E p . hy (3) {3} Bo 8g Bg, @ 5. 410) By (10) By (13) {13) By p 83 a a RE REo (2) (5) eth (14) {2} (5) 111) (14) LIC-562 Ro Ry Ro Rg Ro Ry Ry A3 LIC-563 ORDERING INFORMATION CONNECTION DIAGRAM (Top View) Am8T26A Am8T28 Veco B/E Rg Bz Dz Re Bz Dg Package Temperature Order Order Type Range Number Number Molded DIP OC to +75C N8T26AB N8T28B Hermetic DIP OC to +75C N8T26AF N8T28F Dice 0C to +75C AMBT26AXC AMB8T28XC Hermetic DIP 55C to +125C = S8T26AF S8T28F RIE Ro 8 Op Ry @, 0) GND Dice 55C to #125C AM8T26AXM AM8T28XM Note: Pin 1 is marked for orientation. Lic-564 12-84AAXIMUM RATINGS (Above which the useful life may be impaired} Am8T26A/8T28 torage Temperature 65C to +150C emperature (Ambient) Under Bias 5BC to +125C upply Voltage to Ground Potential (Pin 16 to Pin 8) Continuous 0.5V to +7V YC Voltage Applied to Outputs for HIGH Output State 0.5V to +Vcc max. dC Input Voltage 0.5V to +5.5V )C Output Current, Into Outputs (Receiver) 30mA YC Output Current, Into Outputs (BUS) BOmA IC Input Current 30mA to +5.0mA :LECTRICAL CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE he Following Conditions Apply Unless Otherwise Noted: IBT26A, N8&T28 Ta =0C to +75C(COM'L) MIN. = 4.75V MAX. = 5.25V @T26A, SBT28. Ta =S5C to +125C(MIL) MIN. =4.50 MAX. = 5.50V XC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE Typ. *arameters Description Test Conditions (Note 1) Min. (Note 2) Max. Units driver We Low Level Input Current Vin =0.4V 200 uA He Low Level Input Current (Disabled) Vin =0.4V 50 BA Iiy High Level Input Current (Din, De) Vin = VocMAX. 25 LA VoL Low Level Output Voltage louT =48mA (Note 5} 0.5 Volts Vou High Level Output Valtage louT = -10mA, Vec = VecMIN. (Note 6} 24 Volts los Short Circuit Output Current Vout =9V. Voc = Voc MAX. (Note 4) 50 150 mA Receiver "iL Low Level Input Current Vin =0.4V 200 BA Wy High Level Input Current{Re} Vin = VCcCMAX. 25 vA VoL Low Level Output Voltage \oUT = 20mA (Note 5) 0.5 Volts VOH High Level Output Voltage lout = 100#A. Voc = .0V 35 Volts louT = 2.0mA (Note 6) 2.4 los Short Circuit Output Current Vout =9V, Veco = Vee MAX. 30 75 mA Both Driver and Receiver VIL Low Level Input Threshold Voltage 0.85. Valts VTH High Level Input Threshold Valtage 2.0 Valts lo Low Leve! Output Off Leakage Current VouT =0.5V 100 uA High Level Output Off Leakage Current VouT = 2.4V 100 BA Vv Input Clamp Voltage {jn = 12mA ~1.0 Volts PWR/ Power/Current Consumption Am8T26A| Vcc = VocMAX. 487/87 mWw/mA lec Am8T28 | Voc = VccMAX. 578/110 Switching Characteristics (Ta = +25C, Vcc = 5.0V) Am8T26A Am8T28 Parameters Description Test Conditions Min. Typ. Max. Min. Typ. Max. Units tPLH ; , 10 14 13 V7 Driver Input to Bus Figure 1 ns tPHL 10 14 13 17 tPLH 9.0 14 12 7 Bus to Receiver Output Figure 2 ns tPHL 6.0 14 9.0 17 t2b Driver Enable to Bus Figure 3 9 28 2 28 ns tLz 15 20 18 23 tZL Receiver Enable to Figure 4 15 20 18 23 ns tLz Receiver Output 10 15 13 18 Notes: . For conditions shown as MIN. or MAX., use the appropriate value spe . Typical limits are at Voc = 5.0V, 25C ambient and maximum loading. . Actual input currents = Unit Load Current x Input Load Factor (See Loading Rules}. he short circuit test should not exceed one second. . Output sink current is supplied through a resistor to Vee . Measurements apply to each output 1 2 3 4. Not more than one output should be shorted at a time. Duration of t 5 6 and the associated data input independently. 12-85 cified under Electrical Characteristics for the applicable device type.Am8T26A/8T28 DEFINITION OF FUNCTIONAL TERMS LOADING RULES (In Unit Loads) Dog, D4,D2,B3 The four driver inputs. Bo, By, Bz, Bg Fhe four driver outputs and receiver inputs Low Fan-out (data is inverted) Input Output Output . . Input/Output Pin No.s Unit Load HIGH LOW Ro, Ri, Ra, R3 The four receiver outputs. Data from the RIE 7 18 bus is inverted while data from the driver inputs is non- inverted. Ro 2 = 50 40 B/E Bus enable input. When the bus enable input is LOW, Bo 3 1/16 250 25 the four driver outputs are in the high-impedance state. Do 4 1/8 - - R/E Receiver enable input. When the receiver enable input Ry 5 - 50 10 is HiGH, the four receiver outputs are in the high-impedance By 6 1N6 250 25 state, Dy 7 V8 - - GND 8 = _ D2 9 1/8 - _ Bo 10 116 250 25 R2 11 - 50 10 D3 12 1/8 - - B3 13 1/16 250 25 R3 14 - 50 10 B/E 15 1/8 - - Vec 16 - ~ - A TTL Unit Load is defined as 1.6mA measured at 0.4V LOW and 402A measured at 2.4V HIGH. DRIVER FUNCTION TABLE RECEIVER FUNCTION TABLE Am8T26A | Am8T28 Am8T26A | Am8T28 INPUTS OUTPUT | OUTPUT INPUTS OUTPUT | OUTPUT B/E Dj By Bj R/E Bj Rj Rj L x Z Zz H x Zz Z H L L L L H L H H L H L H L H L= LOW X = Dont Care L= LOW X = Dont Care H = HIGH Z = High Impedance H = HIGH Z = High Impedance i=0,1,2,o0r3 i=0,1,2,or3 INPUT/OUTPUT CURRENT INTERFACE CONDITIONS BUS DRIVER RECEIVER OUTPUT | OUTPUT | ALL INPUTS 4 Yeo f t 452 | 602 | SkQ NOM. NOM NOM. 'ou | 'ou | Ne tou | Tou | WH Note: Actual current flow direction shown. LIC-565 12-86Am8T26A/8T28 AC TEST CIRCUITS AND WAVEFORMS PROPAGATION DELAY (Data In to Bus) 2.6V Gree =5.0V 2.6V 89 -o 302 INPUT 1.5V 15v B/E 8;-o 4 RIE 8 -o oa L- _- om 'PLH 8 o 0 3f-o W00pF SE 2600 outPuT 15V 15V oo Ro --o : : PULSE 1 GENERATOR o 4} R, bo o. Ro Lo sNPUT PULSE: 3 2 = t, = ty = 5s (10% to 90%) Ry freq = 1DMHz {50% duty cycle) Amplitude = 2.6V Lt LIC-867 LIC-566 Figure 1 LIC-568 PROPAGATION DELAY (Bus to Receiver Out) Voc = 5.0V 89 INPUT 1.5 1sVv ave 8 PULSE By GENERATOR ev a e| b- _.| Pr 'PLH QuTPUT * 1.5 # 15 ~ 1 INPUT PULSE: J ty = ty = Bris (10% to 90%) 30f oA freq = 10MHz {50% duty cycle) Amplitude = 2.6 LIC-570 Lic-569 Figure 2 LIC-571 PROPAGATION DELAY (Bus Enable to Bus Output) 2.6V Voc INPUT 1.5 1.5 Bo -o PULSE B o t | - - tt GENERATOR B/E 1 a | ie RIE 821+-o | iT 0p By ouTPU 15 tor Dy Ro -O Og Ry =.) INPUT PULSE 1, = ty = 5ns (10% to 90%) Dg Ro +.) freq = SMHz (50% duty cycle) Amplitude = 2.6V 3}-O L LIC-573 LIC-572 Figu re 3 LIC-574 PROPAGATION DELAY: (Receive Enable to Receive Output} veg 2.6 Bo INPUT 1.5V 1.6V pt B/E By 5.0V PULSE B 5 " _.| T, GENERATOR o RIE 2 te at e10 Bg { [ bt Dy Rg -O 2 24k 2400 2 OuTPUT 10% 4 b4 2 Rio LID, Robo Kt INPUT PULSE Lg ty = ty = Ss (10% to 90%) R3 freq = SMHz (50% duty cycle) BKNS Amplitude = 2.6V (PROBEIS P= 30PF LIG-576 1 = C-577 Figure 4 Les LIC-575 12-87Am8T26A/8T28 APPLICATION ~~ ~- | 48:7 Bus TO OTHER + | amerze's B B 8 8 B a 0 1 2 Dp 80 1 2 Ro D R A 1 1 pats AmBT26A Am8T26A DATA Dy Ro ouT D3 H = TRANSMIT H = TRANSMIT L = RECEIVE L = RECEIVE LiC-57a Metallization and Pad Layouts Am8T26A Am8T28 Yeo Voc RIE B/E RYE B/E Ro Ry Ro Ry Bo By Bg 83 Dg D3 Dg D3 Ry Ry Ry Ry 8, By By Bo Dy Da Dy bz GND GND DIE SIZE 0.058" X 0.091" DIE SIZE 0.058 X 0.091 12-88