| Parameter | Test Conditions | Symbol | Min | Typ | Max | Unit |
| Luminous Intensity | IF=20mA | Iv | 70 | 150 | | mcd |
| Forward Voltage | IF=20mA | VF | | 3.7 | 4.2 | V |
| Reverse Current | VR=5V | IR | | | 100 | A |
| Peak/Dominant Wavelength | IF=20mA | d | | 525 | | nm |
| Spectral Linewidth | IF=20mA | | | 35 | | nm |
| Viewing Angle | IF=20mA | 201/2 | | 120 | | deg. |
| | | | | | |
The 27CX256 has two control functions, Chip Enable (CE) and Output Enable (OE), which must both be held low for data to be accessed from the EPROM. CE is the power control and should be used for device selection. OE is the output control and should be used to gate data to the output pins if the device is selected._ It is recommended that CE be decoded and used as the primary device selecting function, while OE should be made a common connection to all devices in the array and connected to the read line from the system control bus. This will assure that all deselected memory devices are in their low- power standby mode and that the output pins are only active when data is desired from a particular device. Assuming the addresses are stable, address ac- cess time (tACC) iS equal to the delay from CE to the output (tcs). Data is available at the outputs tOE after the falling edge of OE, assuming CE has been low and addresses have been stable for at least
