 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| MC74F3893A QUAD FUTUREBUS BACKPLANE TRANSCEIVER (3 STATE + OPEN COLLECTOR) The MC74F3893A is a quad backplane transceiver and is intended to be used in very high speed bus systems. The MC74F3893A interfaces to "Backplane Transceiver Logic" (BTL). BTL features a reduced (1 V) voltage swing for lower power consumption and a series diode on the drivers to reduce capacitive loading (< 5 pF). Incident wave switching is employed, therefore BTL propagation delays are short. Although the voltage swing is much less for BTL, so is its receiver threshold region, therefore noise margins are excellent. BTL offers low power consumption, low ground bounce, reduced EMI and crosstalk, low capacitive loading, superior noise margin and short propagation delays. This results in a high bandwidth, reliable backplane. The MC74F3893A has four TTL outputs (Rn) on the receiver side with a common Receive Enable input (RE). It has four data inputs (Dn) which are also TTL. These data inputs are NANDed with the Data Enable input (DE). The four I/O pins (Bus side) are futurebus compatible, sink a minimum of 100 mA, and are designed to drive heavily loaded backplanes with load impedances as low as 10 ohms. All outputs are designed to be glitch-free during power up and power down. * Quad Backplane Transceiver * Drives Heavily Loaded Backplanes with Equivalent Load Impedances Down to 10 ohms * Futurebus Drivers Sink 100 mA * Reduced Voltage Swing (1 Volt) Produces Less Noise and Reduces Power Consumption * High Speed Operation Enhances Performance of Backplane Buses and Facilitates Incident Wave Switching * Compatible with IEEE 896 and IEEE 1194.1 Futurebus Standards * Built-In Precision Band-Gap (BG) Reference Provides Accurate Receiver Threshold and Improved Noise Immunity * Glitch-Free Power Up/Power Down Operation On All Outputs * Pin and Function Compatible with NSC DS3893A and Signetics 74F3893 * Separate Bus Ground Returns for Each Driver to Minimize Ground Noise * MOS and TTL Compatible High Impedance Inputs PINOUT: 20-LEAD PLCC (TOP VIEW) I/O0 18 BUS GND BG GND VCC D0 R0 19 20 1 2 3 4 D1 5 6 7 D2 8 R2 BUS I/O1 GND 17 16 I/O2 15 I/O3 14 13 12 11 10 9 BUS GND RE DE R3 D3 QUAD FUTUREBUS BACKPLANE TRANSCEIVER (3 STATE + OPEN COLLECTOR) FASTTM SCHOTTKY TTL 19 3 4 8 FN SUFFIX PLASTIC CASE 775-02 ORDERING INFORMATION MC74FXXXXAFN Plastic LOGIC SYMBOL 2 11 12 DE D0 4 D1 7 D2 9 D3 RE I/O0 I/O1 I/O2 I/O3 R0 R1 R2 R3 18 17 15 14 3 5 8 10 R1 LOGIC GND FAST AND LS TTL DATA 4-273 MC74F3893A LOGIC DIAGRAM D0 2 18 I/O0 R0 3 D1 4 17 I/O1 5 R1 12 D2 7 15 RE I/O2 R2 8 D3 9 14 I/O3 R3 DE 10 11 VCC = PIN 1: LOGIC GND = PIN 6 BUS GND = PIN 13,16, 19: BG GND = PIN 20 FUNCTION TABLE Inputs DE H H H L L L RE L L H H L L Dn L H L H X X Input/Output I/On H L Dn H H L Outputs Rn L H Z Z L H Operating Mode Transmit to Bus Receiver 3-State, Transmit to Bus Receive, I/On = Inputs H = HIGH voltage level: L = LOW voltage level: X = Don't care: Z = HIGH impedance "Off" state. RECOMMENDED OPERATING CONDITIONS Limits Symbol VCC VIH VIL IIK VTH IOH IOL TA Supply Voltage High-Level Input Voltage Low-Level Input Voltage Input Clamp Current Bus Input Threshold Output Current High Output Current Low Operating Ambient Temperature Range I/On Only Rn Only Dn, DE, RE Parameter Min 4.5 2.0 -- -- 1.475 -- -- 0 Typ 5.0 -- -- -- 1.550 -- -- -- Max 5.5 -- 0.8 -18 1.625 -3.0 100 70 Unit V V V mA V mA mA C FAST AND LS TTL DATA 4-274 MC74F3893A DC CHARACTERISTICS (Over Recommended Operating Free-Air Temperature Range Unless otherwise specified) Limits Symbol VOH Parameter High-Level Output Voltage Rn Min 2.5 Typ (2) -- Max -- Unit V Test Conditions (Note 1) VCC = MIN: VIL = 1.3 V; RE = 0.8 V: IOH = MAX VCC = MAX: DN = DE = 0.8 V: VT = 2.0 V: RT = 10: RE = 2.0 V IOH = MAX VCC = MIN: VIN = 1.8 V; RE = 0.8 V: IOL = 6.0 mA Dn = DE = VIH: IOL = 100 mA Dn = DE = VIH: IOL = 80 mA V -- -- -- -- -- -- -- -- -250 -- Rn -- -80 -- -- -0.73 -- -- -- -- -- -- -- -- -- -- 55 3.2 -1.2 100 20 100 -100 -200 -500 100 20 -20 -200 80 mA mA A A VCC = MAX: VI = 0.5V: DE = 4.5 V Dn = 4.5 V V A A A VCC = MAX or 0 V: DN = DE = 0.8 V: RE = 2.0 V VCC = MIN, II = IIK VCC = MAX: VI = 7.0 V: DE = RE = Dn = VCC VCC = MAX: DE = RE = Dn = 2.5 V VCC = 0 V: DN = DE = 0.8 V: I/On = 1.2 V: RE = 0 V: I/On = 1.0 mA I/On = 10 mA VOHB High-Level Output Bus Voltage I/On 1.9 -- -- V VOL VOLB Output LOW Voltage Rn I/On -- 0.75 0.35 1.0 1.0 -- 0.5 1.2 V Low Level Output Bus Voltage V 0.75 -- 1.1 2.9 VOCB VIK II IIH IIHB Driver Output Positive Clamp Voltage Input Clamp Diode Voltage I/On Input Current at Maximum Input Voltage High Level Input Current High-Level I/O Bus Current (Power Off) Dn, RE, DE I/On RE IIL Low-Level Input Current Dn DE IILB IOZH IOZL IOS ICC Low-Level I/O Bus Current (Power On) Off-State Output Current, HighLevel Voltage Applied Off-State Output Current, Low-Level Voltage Applied Output Short Circuit Current (Note 3) Supply Current (Total ) I/On VCC = MAX: Dn = DE = 0.8 V: I/On = 0.75 V : RE = 0 V: VO = 2.5V: RE = 2.0 V VCC = MAX: VO = 0.5 V: RE = 2.0 V Dn = 1.2 V: VO = 0 V: RE = 0.8 V VCC = MAX: (RE = VIH or VIL) VCC = MAX: A NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable device type. 2. All typical values are at VCC = 5.0 V, TA = + 25C. 3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a High output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last. FAST AND LS TTL DATA 4-275 MC74F3893A AC ELECTRICAL CHARACTERISTICS for Receiver and Receiver Enable 74F TA = +25C VCC=+5.0V, VT=+2.0V CD = 30 pF RT = 10 Symbol tPLH tPHL tPLH tPHL tTLH tTHL tDskew Parameter Propagation Delay Dn to I/On Propagation Delay DE to I/On Dn to I/On Transition Time 10% to 90%, 90% to 10% Skew Between Receivers in Same Package Min -- -- -- -- -- -- -- Typ -- -- -- -- -- -- 1.0 Max -- -- -- -- -- -- -- 74F TA = 0C to +70C VCC=+5.0V 10%,VT=+2.0V CD = 30 pF RT = 10 Min 1.0 1.0 1.0 1.0 1.0 1.0 -- Max 7.0 7.0 7.0 7.0 5.0 5.0 -- Unit ns ns ns ns AC ELECTRICAL CHARACTERISTICS for Receiver 74F TA = +25C VCC=+5.0V CL = 50 pF RL = 1.0K Symbol tPLH tPHL tDskew Parameter Propagation Delay I/On to Rn Skew Between Receivers in Same Package Min -- -- -- Typ -- -- 1.0 Max -- -- -- 74F TA = 0C to +70C VCC=+5.0V 10% CL = 50 pF RL = 1.0K Min 2.0 2.0 -- Max 8.0 8.0 -- Unit ns ns AC ELECTRICAL CHARACTERISTICS for Receiver Enable 74F TA = +25C VCC=+5.0V CL = 50 pF RL = 500 Symbol tPZH tPZL tPHZ tPLZ Parameter Output Enable to High or Low Level RE to Rn Output Disable From High or Low Level RE to Rn Min -- -- -- -- Typ -- -- -- -- Max -- -- -- -- 74F TA = 0C to +70C VCC=+5.0V 10% CL = 50 pF RL = 500 Min 2.0 2.0 1.0 1.0 Max 12.0 12.0 8.0 8.0 Unit ns ns FAST AND LS TTL DATA 4-276 FAST AND LS TTL DATA 4-277 |
Price & Availability of MC74F3893A
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |