Siemens SAB8286A 8-Bit Bi-Directional Microprocessor Driver +5V 90mA DIP-20
The SAB 8286A is an 8-bit bipolar octal bus transceiver with high-impedance 3-state outputs, designed by Siemens using their Advanced Standard Buried Collector (ASBC) fast bipolar process. It serves as a non-inverting data bus buffer and driver engineered to interface local processor data buses directly with system data buses in high-demand microcomputer environments.
Features
- Fully Parallel 8-Bit Transceiver Architecture
- 3-State High-Impedance Outputs for Bus Sharing
- 40% Less Power Supply Current than Standard SAB 8286
- High Output Drive Capability for Driving System Data Buses
- No Output Low Noise/Glitching during 3-State Transitions
- Fully Backward Compatible with Standard SAB 8286 / SAB 8287
- Fabricated in Fast Bipolar ASBC Process
- Standard 20-Pin Plastic Dual In-Line Package (DIP-20)
Specifications
| Parameter |
Symbol |
Min |
Max |
Unit |
Test Condition / Notes |
| Supply Voltage |
VCC |
4.5 |
5.5 |
V |
+5V ±10% Operating Range |
| Power Supply Current |
ICC |
— |
90 |
mA |
All outputs open |
| Power Dissipation |
PD |
— |
1.0 |
W |
Absolute Maximum Rating |
| Operating Temperature Range |
TA |
0 |
+70 |
°C |
Temperature Under Bias |
| Storage Temperature |
TSTG |
-65 |
+150 |
°C |
Absolute Maximum Rating |
| Output LOW Voltage (B Outputs) |
VOL(B) |
— |
0.45 |
V |
IOL = 32 mA |
| Output LOW Voltage (A Outputs) |
VOL(A) |
— |
0.45 |
V |
IOL = 16 mA |
| Output HIGH Voltage (B Outputs) |
VOH(B) |
2.4 |
— |
V |
IOH = -5 mA |
| Output HIGH Voltage (A Outputs) |
VOH(A) |
2.4 |
— |
V |
IOH = -1 mA |
| Input LOW Voltage (A Side) |
VIL(A) |
— |
0.8 |
V |
VCC = 5.0V |
| Input LOW Voltage (B Side) |
VIL(B) |
— |
0.9 |
V |
VCC = 5.0V |
| Input HIGH Voltage |
VIH |
2.0 |
— |
V |
VCC = 5.0V |
| Input Capacitance |
CIN |
— |
12 |
pF |
F = 1 MHz, VBIAS = 2.5V, TA = 25°C |
| Input to Output Delay (Non-Inverting) |
tIVOV |
5 |
30 |
ns |
A to B or B to A propagation delay |
| Output Enable Time |
tELOV |
10 |
30 |
ns |
OE active LOW to valid output |
| Output Disable Time |
tEHOZ |
5 |
18 |
ns |
OE inactive HIGH to 3-state |
Pin Definitions & Functions (20-Pin DIP)
| Pin No. |
Symbol |
Type |
Function |
| 1 – 8 |
A0 – A7 |
I/O |
Local Bus Data Pins: Interface with the processor local bus depending on the state of control pin T. |
| 9 |
OE |
Input |
Output Enable (Active LOW): Enables output drivers onto their respective bus. HIGH puts outputs into high-impedance state. |
| 10 |
GND |
Power |
Ground: 0V reference. |
| 11 |
T |
Input |
Transmit Control Signal: Controls data direction. HIGH: A → B. LOW: B → A. |
| 12 – 19 |
B7 – B0 |
I/O |
System Bus Data Pins: Interface with system bus lines (Non-Inverting). Pin 12 = B7 … Pin 19 = B0. |
| 20 |
VCC |
Power |
Power Supply: +5V power connection. |
Functional Logic / Operational Mode
| Output Enable (OE) |
Transmit (T) |
Data Direction / Operation |
| LOW |
HIGH |
Data at local bus (A0–A7) is driven onto system bus (B0–B7) |
| LOW |
LOW |
Data at system bus (B0–B7) is driven onto local bus (A0–A7) |
| HIGH |
X (Don’t Care) |
Outputs in High Impedance (3-State Isolation) |
Applications
- Microcomputer system data bus expansion and isolation
- Bidirectional interface between local processor data buses and main memory/peripheral buses
- Legacy computer maintenance, repair, and retrocomputing development
- High-capacitance bus drive systems needing low power dissipation
Package Content
- 1 x Siemens SAB8286A 8-Bit Bi-Directional Microprocessor Driver +5V 90mA DIP-20
DataSheet
