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Part: 74ALS240A-1
Category:
Logic
-> Line Driver/Receivers
-> Bipolar->ALS Family
Description: Octal 3-state Bus Driver
Company: Fairchild Semiconductor
Datasheet: Download 74ALS240A-1 datasheet File size : 67 kB
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Datasheet text preview:
DM74ALS240A · DM74ALS241A Octal 3-STATE Bus Driver
September 1986 Revised February 2000
DM74ALS240A · DM74ALS241A Octal 3-STATE Bus Driver
General Description
These octal 3-STATE bus drivers are designed to provide the designer with flexibility in implementing a bus interface with memory, microprocessor, or communication systems. The output 3-STATE gating control is organized into two separate groups of four buffers. The DM74ALS240A control inputs symmetrically enable the respective outputs when set logic LOW, while the DM74ALS241A has complementary enable gating. The 3-STATE circuitry contains a feature that maintains the buffer outputs in 3-STATE (high impedance state) during power supply ramp-up or rampdown. This eliminates bus glitching problems that arise during power-up and power-down.
Features
s Advanced low power Schottky TTL process oxide-isolated ion-implanted s Functional and pin compatible with the DM74LS counterpart s Improved switching performance with less power dissipation compared with the DM74LS counterpart s Switching response specified into 500 and 50 pF load s Switching response specifications guaranteed over full temperature and VCC supply range s PNP input design reduces input loading s Low level drive current: 74ALS = 24 mA
Ordering Code:
Order Number DM74ALS240AWM DM74ALS240ASJ DM74ALS240AN DM74ALS241AWM DM74ALS241AN Package Number M20B M20D N20A M20B N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagrams
DM74ALS240A DM74ALS241A
© 2000 Fairchild Semiconductor Corporation
DS006210
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DM74ALS240A · DM74ALS241A
Function Tables
DM74ALS240A Input G L L H A L H X Output Y H L Z 1G L L H Input 1A L H X DM74ALS241A Output Y L H Z 2G H H L Input 2A L H X Output Y L H Z
Logic Diagrams
DM74ALS240A DM74ALS241A
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DM74ALS240A · DM74ALS241A
Absolute Maximum Ratings(Note 1)
Supply Voltage, VCC Input Voltage Voltage Applied to Disabled Output Operating Free Air Temperature Range Storage Temperature Range Typical JA N Package M Package 60.5°C/W 79.8°C/W 7V 7V 5.5V 0°C to +70°C -65°C to +150°C
Note 1: The "Absolute Maximum Ratings" are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The "Recommended Operating Conditions" table will define the conditions for actual device operation.
Recommended Operating Conditions
Symbol VC C V IH V IL IOH IOL TA Supply Voltage HIGH Level Input Voltage LOW Level Input Voltage HIGH Level Output Current LOW Level Output Current Operating Free Air Temperature 0 Parameter Min 4.5 2 0.8 -1 5 24 70 Typ 5 Max 5.5 Units V V V mA mA °C
Electrical Characteristics
over recommended operating free-air temperature range (unless otherwise specified) Symbol VIK VOH Parameter Input Clamp Voltage HIGH Level Output Voltage VOL II IIH IIL IO IOZH IOZL ICC LOW Level Output Voltage Input Current at Max Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current HIGH Level 3-STATE Output Current LOW Level 3-STATE Output Current Supply Current VCC = 4.5V to 5.5V VCC = 4.5V VCC = 4.5V IOL = Max VCC = 5.5V, VI = 7V VCC = 5.5V, VI = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V, VO = 2.7V VCC = 5.5V, VO = 0.4V VCC = 5.5V, ALS240A Outputs HIGH Outputs LOW Outputs 3-STATE VCC = 5.5V, ALS241A Outputs HIGH Outputs LOW Outputs 3-STATE 4 13 14 9 15 17 - 30 Conditions VCC = 4.5V, II = -18 mA IOH = -0.4 mA IOH = -3 mA IOH = Max VCC - 2 2.4 2 0.35 0.5 0.1 20 -0.1 -112 20 - 20 10 23 25 15 26 30 M in Typ Max -1.5 Units V V V V V mA µA mA mA µA µA mA mA mA mA mA mA
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DM74ALS240A · DM74ALS241A
Switching Characteristics DM74ALS240A
over recommended operating free air temperature range Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output Output Disable Time from LOW Level Output G Y 3 12 ns Conditions VCC = 4.5V to 5.5V, CL = 50 pF, R1 = 500, R2 = 500, TA = Min to Max G Y 3 2 18 10 ns ns A Y 2 3 9 13 ns ns From (Input) To (Output) Min 2 M ax 9 Units ns
Switching Characteristics DM74ALS241A
over recommended operating free air temperature range Symbol tPLH tPHL tPZH tPZL tPHZ tPLZ tPZH tPZL tPHZ tPLZ Parameter Propagation Delay Time LOW-to-HIGH Level Output Propagation Delay Time HIGH-to-LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to HIGH Level Output Output Disable Time to HIGH Level Output Output Disable Time to LOW Level Output Output Enable Time to HIGH Level Output Output Enable Time to LOW Level Output Output Disable Time from HIGH Level Output Output Disable Time from LOW Level Output 2G Y 3 15 ns 2G Y 7 2 21 10 ns ns 1G Y 3 7 15 21 ns ns Conditions VCC = 4.5V to 5.5V, CL = 50 pF, R1 = 500, R2 = 500, TA = Min to Max 1G Y 3 2 21 10 ns ns A Y 3 3 10 21 ns ns From (Input) To (Output) Min 3 M ax 11 Units ns
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DM74ALS240A · DM74ALS241A
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Package Number M20B
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Others parts begin by 74
74-1 74-2 74-3 74-4 74-5 74-6 74-7 74-8 74-9 74-10 74-11 74-12 74-13 74-14 74-15 74-16 74-17 74-18 74-19 74-20 74-21 74-22 74-23 74-24 74-25 74-26 74-27 74-28 74-29 74-30 74-31 74-32 74-33 74-34 74-35 74-36 74-37 74-38 74-39 74-40 74-41 74-42 74-43 74-44 74-45 74-46 74-47 74-48 74-49 74-50 74-51 74-52 74-53 74-54 74-55 74-56 74-57 74-58 74-59 74-60 74-61 74-62
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