SN54ALS569A

• 3-State Q Outputs Drive Bus Lines Directly
• Counter Operation Independent of 3-State Output
• Fully Synchronous Clear, Count, and Load
• Asynchronous Clear Is Also Provided
• Fully Cascadable
• Package Options Include Plastic Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300 mil DIPs

Supply voltage, V_CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, V_I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  7 V
Voltage applied to a disabled 3-state output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V
Operating free-air temperature range, T_A:SN54ALS569A . . . . . . . . . . . . . . . . . . . . . . . . . . ........ 55°C to 125°C
                                                             SN74ALS568A, SN74ALS569A . . . . . . . . . . . . . . . . ................ 0°C to 70°C
Storage temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65°C to 150°C

The SN74ALS568A decade counter and 'ALS569A binary counters are programmable, count up or down, and offer both synchronous and
asynchronous clearing. All synchronous functions of SN54ALS569A are executed on the positive-going edge of the clock (CLK) input.
The clear function is initiated by applying a low level to either asynchronous clear (ACLR) or synchronous clear (SCLR). Asynchronous (direct) clearing overrides all other functions of the device, while synchronous clearing overrides only the other synchronous functions. Data is loaded from the A, B, C, and D inputs by holding load (LOAD) low during a positive-going clock transition. The counting function of SN54ALS569A is enabled only when enable P (ENP) and enable T (ENT) are low and ACLR, SCLR, and LOAD are high. The up/down (U/D) input controls the direction of the count. These counters count up when U/D is high and count down when U/D is low.
A high level at the output-enable (OE) input forces the Q outputs into the high-impedance state, and a low level enables those outputs. Counting is independent of OE. ENT is fed forward to enable the ripple-carry output (RCO) to produce a low-level pulse while the count is zero (all Q outputs low) when counting down or maximum (9 or 15) when counting up. The clocked carry output (CCO) produces a low-level pulse for a duration equal to that of the low level of the clock when RCO is low and the counter is enabled (both ENP and ENT are low); otherwise, CCO is high. CCO does not have the glitches commonly associated with a ripple-carry output. Cascading is normally accomplished by connecting RCO or CCO of the first counter to ENT of the next counter. However, for very high-speed counting, RCO should be used for cascading since CCO does not become active until the clock returns to the low level.
The SN54ALS569A is characterized for operation over the full military temperature range of 55°C to 125°C.
The SN74ALS568A and SN74ALS569A are characterized for operation from 0°C to 70°C.