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> NTE8216 (ic-schottky bus driver )
NTE8216 (ic-schottky bus driver )
are low power TTL compatible. For driving MOS, the DO outputs provide high 3.65V V
high current capacitance terminated bus structures, the DB outputs provide a high 50mA I
Data Bus Buffer Driver for 8080 CPU
High Output Drive Capability for Driving System Bus
3.65V Output High Voltage for Direct Interface to 8080 CPU
All Output and Supply Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5V to +7V
All Input Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.0V to +5.5V
Output Currents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125mA
Temperature Under Bias . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0
Stoage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Note 1. Stresses above those listed under Absolute Maximum Ratings may cause permanent
damage to the device. This is a stress rating only and functional operation of the device at
these or any other conditions above those indicated in the operational sections of this specification
is not implied. Exposure to absolute maximum rating conditions for extended periods
may effect device reliability.
(TA = 0 to +70 C, VCC = +5V }5%, Note 2)
Input Load Current (DIEN, CS) I
F 1 VF = 0.45V 0.15 0.5 mA
Inpu Load Current (All Other Inputs) I
F 2 VF = 0.45V 0.08 0.25 mA
Input Leakage Current (DIEN, CS) I
Input leakage Current (DI Inputs) I
O| VO = 0.45V/5.25VCC 20 A
Low Voltage VOL 1 DO Outputs IOL = 15mA,
OL 2 DB Outputs IOL = 55mA 0.5 0.6 V
High Voltage VOH 1 DO Outputs IOH = 1mA 3.65 4.0 V
OH 2 DB Outputs IOH = 10mA 2.4 3.0 V
Output Short Circuit Current I
OS DO Outputs VO 0V 15 35 65 mA
Note 2. Typical values are for T
(BBIAS = 2.5V, VCC = +5V, TA = +25 C, f = 1MHz, Note 2, Note 3)
Note 3. This parameter is periodically sampled an not 100% tested.
(TA = 0 to +70 C, VCC = +5V }5%, Note 2, Note 4)
Input to Output Delay (DO Outputs) T
pD 1 CL = 30pF, R1 = 300 , R2 = 600 15 25 ns
Input to Output Delay (DB Outputs) T
pD 2 CL = 300pF, R1 = 90 , R2 = 180 19 30 ns
Note 4. Typical values are for T
L = 30pF, R1 = 300/10K , R2 = 180/1K ; DB Outputs, CL = 300pF, R1 = 90/10K ,
L = 5pF, R1 = 300/10K , R2 = 600/1K ; DB Outputs, CL = 5pF, R1 = 90/10K ,
Microprocessors like the 8080 are MOS devices and are generally capable of driving a single TTL
load. The same is true for MOS memory devices. While this type of drive is sufficient in small systems
with few components, quite often it is necessary to buffer the microprocessor and memories when
adding components or expanding to a multi
directional bus driver specifically designed to buffer microcomputer system
Each buffered line of the four bit drive consists of two separate buffers that are tri
achieve direct bus interface and bi
directional capability. On one side of the driver the output of one
buffer and the input of another are tied together (DB), this side is used to interface to the system side
components such as memories, I/O, etc., because its interface is direct TTL compatible and it has
high drive (50mA). On the other side of the driver the inputs and outputs are separated to provide maximum
flexibility. Of course, they can be tied together so that the driver can be used to buffer a true
directional bus such as the 8080 Data Bus. The DO outputs on this side of the driver have a special
high voltage output drive capability (3.65V) so that direct interface to the 8080 and 8008 CPUs is
achieved with an adequate amount of noise immunity (350mV worst case).
The CS input is actually a device select. When it is
high the output drivers are all forced to their high
impedance state. When it is at
zero the device is selected (enabled) and the direction of the data
flow is determined by the DIEN input.
The DIEN input controls the direction of the data flow. This direction control is accomplished by forcing
one of the pair of buffers into its high
impedance state and allowing the other to transmit its data. A
simple two gate circuit is used for this function.
The NTE8216 is a device that will reduce component count in microcomputer systems and at the
same time enhance noise immunity to assure reliable, high performance operation.
