NuBus ADDRESS/DATA TRANSCEIVERS AND REGISTERS

The BCT2420 consists of Bus Transceiver circuits, D-type Flip-Flops Latches and control circuitry arranged for multiplexed transmission of address and data information in NuBus applications. An on-chip Comparator has been included to detect when a NuBus transfer cycle is requesting the local board. The device conforms to ANSI/IEEE Std 1196-1987 and operates with Texas instru- ments SN74ACT2440 NuBus Controller. In addition, the device is easily configured around ASIC or other PAL -based controllers. The BCT2420 was designed using Texas Instruments BiCMOS process, which features bipolar drive characteristics and greatly reduces the standby power of the device when disabled. This feature is especially valuable when the device is not performing a NuBus transaction. The AEN, DEN and ADEN inputs control the transceiver functions. Three 16-bit I/O ports, A15A0, D15D0, and AD15AD0, provide for address and data transfer. When the NuBus performs a write cycle to the local board, address information is saved on the rising edge of ACLK. During the last portion of the NuBus write cycle, data information is saved on the rising edge of DCLK. When the local board is performing a write to the NuBus, address and data is multiplexed onto the NuBus via the A/D line. Address and data CAN be latched by using the ALE and DLE input lines respectively. The IDEQ output is used to signal that the local board is being requested by the NuBus. This output is typically fed to the NuBus controller. IDEQ goes active (low) when AD15AD12 are low and AD11AD8 match ID3ID0. IDEQ stays valid until the next address Clock (ACLK) occurs. Internal 10-k pullup resistors are included on the ID3ID0 inputs. The SSEQ output is used to signal the local board that super-slot addresses are being requested. This output is active (low) whenever AD15AD12 are equal to ID3AD0, except when ID3ID0 are all low. In typical NuBus applications, two devices are required to provide the full 32-bit address/data path. Refer to the typical NuBus Interface diagram on page 9 for additional information. The SN74BCT2420 is characterized for operation from 0C to 70C. By Texas Instruments
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SN74BCT2420FN PLCC
SN74BCT2420FNR PLCC




SN74BCT2420 Pinout, Pinouts
SN74BCT2420 pinout,Pin out
This is one package pinout of SN74BCT2420,If you need more pinouts please download SN74BCT2420's pdf datasheet.

SN74BCT2420 Application circuits
SN74BCT2420 circuits
This is one application circuit of SN74BCT2420,If you need more circuits,please download SN74BCT2420's pdf datasheet.


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